Hero garbage truck was rented from a yard of decommissioned service vehicles in Sacramento, but the actors never got a chance to drive it in the film. Trick photography, "stunt" drivers and a replicated cabin built inside of a "Budget" rental truck were used to create an impression that the guys are actually driving it.
In order for the garbage truck to lift and drive "Ben Stiller's 1956 Porsche", the special FX crew had to pre-build an undercarriage frame that was mounted on the Porsche and welded onto the truck's forks, to make sure the Porsche didn't "fall off" during shooting.
In the beginning when we get to see inside one of the main character's (Lenny's) place we see an autographed photo of Emilio Estevez, who also played one of the main character being a garbage man in the movie "Men at Work" 1990