Famke Janssen's first brush with co-star Bruce Willis occurred when he asked her to audition for Hudson Hawk (1991) after having seen her in a "Pantene" hair product commercial. She failed the audition.
The movie that Dave (John Goodman) is watching while eating ice cream is Zombeavers (2014)
According to Ralph Garman, on a podcast (Hollywood Babble-On), he is not in the movie anymore because his scenes were cut. This was due to Bruce Willis deeming the scenes featuring Garman unnecessary to shoot.
This movie is a nod to 2014 John Wick movie where Keanu Reeves causes chaos over his dog. The same is what Bruce Willis does in this movie.
John Goodman (Dave) and Tom Middlitch (John) both played in "The Campaign" (2012) together.