Sporty says charitable contributions are deductible for only 20% of earnings.If he gave the money to the school shown, it would actually be 50% of earnings.That is also ignoring whether the money would be taxable which it would not be if found.
Sporty is right. In 1988--the date of this episode--the limit was 20%. And cash income has always been fully taxable regardless of whether it's earned, stolen, won, or found.