 In filming the shot in which Doug #1 introduces Doug #3 to Doug #2,  Doug #2 tosses a beer to Doug #1. Michael Keaton (qv) catching the  beer (tossed by a body double) was shot first. Keaton tossing the  beer (this time *to* a body double) was filmed later. Keatons toss  so perfectly matched the body doubles original toss, that the  planned special effect of digitally erasing the tossed beer can then  adding in a digital beer can was not needed, thereby saving the  production quite a bit of money. This was referred to by the special  effects crew as "The Million Dollar Miracle Beer Can Toss".