Box Office Bomb: The film only grossed $14.6 million on a $15 million budget and was one of the big flops of the 1985 Christmas season (possibly due to the Multiple Endings gimmick). However, it became a Cult Classic on video and cable (where all three endings appeared together).
Carrie Fisher was supposed to play Miss Scarlet, but she had to go to rehab a week before filming began.
Director Jonathan Lynn was a fan of Rowan Atkinson and wanted him to play Wadsworth, but the producers said that Atkinson wasn't a big enough name for American audiences. So instead he cast lifelong friend Tim Curry.
A fourth ending was filmed, but left out because it is less humorous than the others. In this one, Wadsworth killed all the victims due to his disgust at their behavior and a sick need for perfection, and reveals that he has poisoned the other characters as well. The FBI shows up, and Wadsworth confesses by beginning to reenact the plot again. When he gets to the part where he answers the door for Colonel Mustard, he flees. Wadsworth attempts to get away in a police vehicle, but hears a doberman growling from the backseat, and is attacked.