This law explains that if there's a difference between what's stated in legal documents and what is proven in court, it usually doesn't matter unless the difference confuses or harms the other party's ability to argue their case. If someone is misled, the court might allow changes to the documents to make things right.

If there's a minor difference between what's alleged and the evidence, the court can either decide based on the evidence or allow a quick change to the documents without charging anyone extra.

This section explains that if a claim or defense in a legal case isn't supported by evidence in a significant way, it isn't just a small error or discrepancy (called a 'variance'); it's actually a breakdown in proving the claim or defense altogether.

If someone changes their complaint in a lawsuit, they must file the changes with the court and give a copy to the other side involved. The other side then has 30 days to respond, or they could lose by default. This rule also applies if someone files an additional claim in response to another claim. If someone changes their response to a complaint, the opposing side has 10 days to formally object to those changes.

This law allows a party to change their legal documents once without needing the court's permission, either before the other side responds or after a challenge is made but before it is heard. If after the deadline for opposition, both sides must agree to the change. The deadline for the other side to respond to changes starts when the updated documents are served. This rule doesn't apply to special motions under another code section.

This section lays out rules for handling demurrers and motions in court cases. A demurrer, which challenges the legal sufficiency of a complaint, isn't lost if an answer is filed at the same time. If a demurrer is overruled and no answer is yet filed, the court will allow an answer to be filed under fair terms. If a demurrer is sustained, meaning it’s agreed that the complaint is deficient, the court may give permission to amend the complaint under certain conditions and set a deadline. When a motion to strike is granted, a new or revised pleading may be ordered. If such a motion is denied, the party can file an answer instead. If a motion to dismiss a case is denied, a new pleading can be submitted.

This law explains what happens after a court decides on a demurrer, which is an objection to a pleading. If the court decides a demurrer and allows time to amend or respond, that time starts once you're notified of the decision, unless you give up the notice during the court session. Also, if a higher court changes an order that didn't allow changes to the complaint, you have 30 days to file an amended complaint after receiving the court's notice.

If a court agrees with a demurrer, meaning they find a part of the case lacking, they must clearly explain why by pointing to specific parts of the demurrer. The party who lost can choose to skip these detailed explanations if they want.

This law allows a court to fix mistakes in legal documents by changing names or fixing errors. Additionally, the court can let someone amend a document after the deadline if it's fair. If needed, the court can delay a trial for these changes but may require payment of costs to the other side. It also allows someone to get out of a judgment or order if they made a mistake or were caught off guard, but they must ask for this within six months. If a lawyer made a mistake that led to a judgment against their client, the court must cancel it if the client acts within six months. The lawyer may have to pay the other party's fees if relief is granted because of their error. The court can also penalize lawyers or parties up to $1,000 if they cause issues. Lastly, the court can correct mistakes in its records or nullify any invalid orders or judgments.

This law allows a court to reverse a decision or action taken against someone if their lawyer's practice had been taken over by a court in California and that action happened after the court took control of the law practice. To ask for this reversal, it must be done reasonably soon but no later than six months after the court took over the practice. If the decision involves who owns or has rights to property, there is a stricter rule: once notified, the party has 90 days to request a reversal. No detailed explanation of the case's merits is required when asking for this relief.

If someone didn't find out about a lawsuit against them in time to defend themselves and the court has already ruled against them, they can ask the court to undo that decision. This request, called a notice of motion, must be made within a reasonable time—at most, either two years after the ruling, or 180 days after they were formally notified of the ruling. To succeed, they must prove through a sworn statement they didn't know about the lawsuit in time—not because they were avoiding it or being careless. If the court agrees with their reasons and timing, it may allow them to defend themselves in the lawsuit.

If a plaintiff doesn't know the name of someone they're suing, they must mention this in their initial documents and can temporarily use a fake name until they find out the real one. Once the real name is known, the documents must be updated. Importantly, a court can't make a decision against a defendant under a fake name unless it's clear they've been properly informed they're being sued under that fake name. The document served to them must mention they're being sued as the person behind the fake name, and proof of this must be recorded. These rules only apply when fake names are used, not when the wrong real name is used in the lawsuit.

This law says that during court cases, the court should ignore minor mistakes or errors that don't significantly affect anyone's rights. A decision can only be overturned if it's proven that the mistake actually harmed someone and changed the case's outcome. Just because there's an error doesn't automatically mean it caused harm or unfairness.