Character mistake: When Henry is describing the fishing reel he bought for his girlfriend, he said, "with jeweled escarpment" actually it is a 'jeweled esCAPEment" not esCARPment. An escarpment is a long slope off a plateau. An escapement is a latch/release mechanism that you would find on a device like a fishing reel.
Not with My Sister You Don't - S1-E19
Character mistake: Howard Borden goes to Bob's office and says it's the first time he's been there. In fact, he had come to the office to address Bob's "fear of flying" group in the first episode.
Character mistake: After Captain Stanley tells the guys about the diet and nutrition study, Cap tells Roy that he and John should go to Oceanside Park for a fire inspection, but later when Johnny's on the HT he tells dispatch to respond Engine 51 to Oceanland Park, not Oceanside Park, and then the dispatcher gives the incident address as Oceanland Park.
Character mistake: When John-Boy reads the nursery rhyme "Simple Simon" to his nephew, John-Boy points to the colorful illustrations in this book and tells John Curtis, "See, that's Simple Simon, he's a bear." This is incorrect. In the illustrations, Simple Simon is a donkey, and it's the pieman who is a bear (he's wearing a chef's hat and apron). (00:40:50)
Character mistake: When Mrs. Slocombe volunteers to sing while Captain Peacock plays piano, Mr. Humphries responds that he didn't know she could sing, even though the department staff has been involved in many musical numbers over the series.