How have courts dealt with errors by a prosecutor at trial?

to understand and correlate instructions and are further presumed to have followed the court's instructions. [Citation.]" (People v. Sanchez (2001) 26 Cal.4th 834, 852.)

The evidence against defendant was quite strong, the prosecutor's comments were brief and indirect and the trial judge acted promptly and appropriately to prevent any problem. Under the circumstances in this record, we conclude beyond a reasonable doubt that if there was error, such error did not contribute to the verdict. (Chapman v. California (1967) 386 U.S. 18)