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When Rick and ALF use Dexter's computer, ALF writes with his left hand. In the series, ALF was right-handed.
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In this movie, when Rick and Melissa carry ALF in a bag, Melissa complains about ALF being heavy and Rick says all of his seven stomachs are full.
But it was established in the series that ALF has eight stomachs.
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ALF never revealed what happened to Jake, Raquel and Trevor.
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In the second season episode We're So Sorry, Uncle Albert, ALF reveals that everyone on Melmac dies at the age of 650. This should have rendered the threat to kill him meaningless.
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In an earlier season ALF said foam was the most valuable thing on Melmac. But in this episode he complained about having a foam pillow.
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About twelve minutes into the episode, a shadow passes behind Neal in the kitchen area as he opens the door to the hallway.
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ALF wakes up Neal by playing Tutti Fruitti. Tutti Fruitti was a hit by Little Richard in 1956.
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When Brian is holding the kitten in the last scene, the positioning of the cat changes in between shots too drastically to have been natural.
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Goof: When ALF reaches into the box and pulls a second kitten onto the table, the position of the condiments on the table changes, as does the position of the first kitten (which appears to be a different cat entirely).
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Lynn refers to Neal as "Uncle Neal" throughout the episode, except for the first time she sees him when she greets her uncle as simply "Neal."
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ALF spends this entire episode trying to educate himself on the birth of babies by watching clips of The Dick Van Dyke Show. Both he and the Tanners seem to forget that he actually delivered a baby all by himself in Season Two's ALF's Special Christmas.
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After the earthquake, the lights likely would not be working.
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In this episode Kate mentions trying to find a day care for when she goes back to work, but in the episode "Changes" she says that she'll be quitting her job to be a full-time mom to the new baby.
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In a shot near the end, some of Alf's hair on his chin is sticking straight out. In the next shot, he is perfectly groomed.
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We learn in this episode that the Melmackian word for "eleven" is "papoon."
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This is the only episode where the Tanners have an answering machine.
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Aaron King is a pun on Elvis. Aaron was his middle name, and King was his title.
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Goof: When Willie enters the kitchen and finds ALF making a huge, messy snack, Willie is holding a completely empty glass of milk which he sets down on the table. In the next shot, he picks up the same glass, which is now full, and takes a drink from it.
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The song that the Tanners are singing at the end of the episode is "We Gather Together" which is a traditional Thanksgiving and Christmas hymn.
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Brian says that he has a school play the next day, but the next day would be Black Friday, and schools are traditionally closed that day.