Continuity mistake: At the bowling ally, when Larry's wife picks up her shoes, the man behind the desk hands her 2 black shoes. As they are leaving, Larry's wife is wearing white tennis shoes. When they arrive at home, she is wearing the black shoes again.
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Other mistake: There are multiple mistakes with the bowling scene in the beginning of the episode. Firstly, Mary is shown finishing her game with a strike. After she strikes she goes back to the table where Ted, Larry, and his wife are sitting. The scores are shown and Ted and Larry say that Larry needs a spare to win. In the scores it shows that Mary's last shot was actually an 8 and not a strike that she had finished with. Secondly, Mary had finished with a 140. Larry's score shows that he has a 120 in the 9th frame, with a strike in his first shot of the 10th frame and a 7 on his second shot. Regardless of whether or not Larry completes his spare, he would not have won, as his max score could only be 140, so he would have tied Mary. And lastly, when Larry goes up to complete his spare which should have had 3 pins remaining, there is a full rack of pins and Larry gets a strike. After his shot it is implied he won the match, even though the scores showed that it was impossible for him to have won.
Continuity mistake: At the beginning of the episode after Mary takes her shot at the bowling alley, the shot shows the scores on the screen. It shows Larry is in the 10th frame, with a strike on his first shot and a 7 on his second, with only a spare conversion of 3 pins left. Larry then says he needs a spare to win. When he goes up to shoot, there is a full rack of pins and he gets a strike, instead of shooting at the 3 pins that should have been left for a spare conversion. Also, when bowling on 1 lane as a group, you bowl 1 frame at a time. After Mary shoots, Larry should have had a full 10th frame without any shots.