Plot hole: Both couples have the same group of friends and they were all invited to both going away parties planned on the same night at the same location. Isn't it likely that at least one of the main characters would have found out about the other party? But at the end, all seem surprised about the other party that was planned for them.

I Love Lucy (1951)
1 plot hole in Drafted - chronological order
Starring: Lucille Ball, Desi Arnaz, Vivian Vance, William Frawley

The Séance - S1-E7
Continuity mistake: After Lucy tells Mr. Merriweather that he's invited to the seance, when it cuts to Lucy unfolding the card table legs, note the couch behind her with one normal seat cushion on the left, but in the next wideshot there's an additional shorter cushion under the normal cushion. The small towel also repositions itself neatly on the couch. (00:11:55)
Lucy Ricardo: How much do you want to bet?
Fred Mertz: Ten dollars.
Ethel Mertz: Well what's the matter with twenty dollars?
Ricky Ricardo: What's the matter with thirty dollars?
Lucy Ricardo: What's the matter with fifty dollars?
Fred Mertz: What was the matter with ten dollars?
Trivia: Lucy, Ricky, Ethel, and Fred all do the impressions of Maurice Chevalier. Thirty-six years later, the same impression is done in the 11th episode of The Simpsons.
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Answer: There is no reason. It's a just a silly plot device, typical of the era. Women characters were often portrayed as making uninformed assumptions or decisions.
raywest ★