In the earlier episode "Office Feud," Catherine--to embarrass Bill--encouraged him to use some made-up inner-city slang words in a malt liquor radio ad. In this episode, Bill and Catherine greet each other with one of those words--"guzizah."
When Jimmy squashes the alien with a phone book, he says "game over"--a nod to Bill Paxton's character, Hudson, in the movie "Aliens."
Mr. James gives the staff copies of the book "To Serve Man", a nod to the Twilight Zone episode To Serve Man (1962).
Dave watches 'Green Acres' and states that 'they're all dead'. At the time the episode aired, only a few regular or recurring cast members were still alive. As of Tom Lester's passing in 2020, leaves no regular nor recurring cast members alive.