Other mistake: The announcer says that the competitors have to run a mile in seven laps. When Hymie begins running, it is clear that the track is way too long for seven laps to qualify as a mile. Maybe it qualifies as 4 miles, perhaps.
Factual error: In several shots in the mile run, Hymie is in the same lane as the Iron Curtain runners, which is illegal and results in disqualification.
Revealing mistake: When Hymie does the high jump, when the film cuts to a shot of him clearing the bar, Hymie's hair is curly when it should be flattened down like when he took of and as he landed. It is obviously a stunt double.
The Reluctant Redhead - S3-E26
Continuity mistake: When Max and Bodecker are escaping, Max has black gloves in one shot, but in all others his hands are uncovered.