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Redecorating - S2-E8
Revealing mistake: At the end of the episode, when Ricky and Lucy walk into the bedroom to see the new wallpaper, look behind them when the bedroom door opens and you'll catch a glimpse of William Frawley - waiting for his cue - hiding behind a wall in the background before he ducks back out of sight.
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 ★