How does George know that Jerry rightfully won the contest ? Let's look at the scenarios (remember they both slept peacefully before falling asleep) :
1 - George masturbated in a hospital bathroom or at his apartment (but why go from the hospital to his apartment to Jerry's ?). Jerry masturbated sometime during the night once George and Elaine had left the apartment. So the next day, Jerry tells George that he won. 2 - George masturbated in a hospital bathroom or at his apartment(but why go from the hospital to his apartment to Jerry's ?). Jerry masturbated from the moment that Marla left and Elaine enters. After the TV scene is finished, Jerry admits to George. 3 - George masturbates in the night, Jerry masturbates in the night. The next day, George enters Jerry's apartment, Jerry tells him first, and at what time he masturbated, George, who's happy that he won the money, either doesn't tell Jerry that he masturbated or he tells him a false time that he masturbated (of course after Jerry).
Which one do you think it is, or have I overlooked one or two. I highly doubt that it's # 3.
GC