Think Through the Accusations
An employer can use red flag words like "consistently" and "regularly" to make it seem that you have a history of certain negative behaviors. They might also use false documentation to set you up for termination...down the line. For instance, make a few mid-level accusations that warrant putting you on a corrective action plan & then saying you didn't make progress or improvement and need suspension or termination. They could just be laying the groundwork!
Read everything carefully & challenge everything that's wrong. No issue is too small because employers are great at making a mountain out of a mole hill. Don't be argumentative in your own defense. Just state the facts professionally. Use examples. Use your own documentation to make your points about any instructions you received, etc.
If someone else is responsible for an error being made, state who did what & where the problem occurred.
Don't leave anything to chance. Read & respond.