Audio problem: Running away from the 'bear', Tully shouts the humorous line; "I'm gonna to bring this up at the next tenants' meeting...there's not supposed to be any pets in the building." However, look at Rick Moranis' face; his lips are not moving and the line was dubbed over. (00:54:10)
Audio problem: When the Archbishop says "How are you, Lenny?" to the Mayor in his office, his lips don't match what he is saying. (01:15:55)
Answer: Chevy Chase, John Candy, Danny DeVito, Peter Falk, Mellisa Gilbert, Carly Simon, Teri Gar, and George Wendt, along with the four major stars of Ghostbusters themselves.