That's what happens when your direction is essentially "do funny things and we'll pick the funniest things you do."
Every character is always on. And since background characters don't have any real substance or depth to draw from, they have to be funny by making fun of things. It's cheap and easy humor.
The movie has no straight men. Look at the original. Everyone besides Murray and Moranis plays the straight man, or at least uses subtle humor.
GB16 reminds me of that Futurama episode where Harold Zoid is directing a movie. "Action! And I mean circus grade action!"
Yup, absolutely on point and an especially interesting observation on background characters having nothing to draw from. Can't blame the actors as much as the direction in that case, again just as Plinkett observed.