Other mistake: When the German soldiers are on the radio alerting other German units of Americans in a captured German tank, they are using the English word "tank"- the Germans should be using the word "panzer", instead.
The Rass'lin' Clampetts - S6-E22
Other mistake: When Granny throws the Boston Strong Girl out of the ring at the end, you can tell that the Boston Strong Girl is jumping to get over the ropes.
Christmas Special 1974 (a.k.a. A Perfect Christmas) - S8-E7
Other mistake: Just after Albert pulls the decorations down, Harold yells as he pricks himself on a nail sticking out of the ladder, however he completely misses the nail.
The West vs. Colonel MacKenzie - S9-E1
Other mistake: In the beginning of 2-19 "The Drifter" the Virginian says it had been 7 years since he had come to the Shiloh. But in this episode he tells him that he and Trampas had been there 9 years. Doesn't add up. He had to be there before Trampas, longer than 9 years.
A Date with Jet Screamer - S1-E2
Other mistake: In the song "Eep Opp Ork Ah Ah" (sung later in the episode), the singer's lyrics say that it means "I love you", but it was first revealed by Elroy and his friend who first wrote that same code to mean "Meet me tonight".