1. Bill Murray was bitten twice by a groundhog during the film shoot, according to the late director Harold Ramis
Back in 1992, Ramis told Premiere magazine, "To be bitten twice means [Murray] stuck around after being bitten once. He's very game." Ramis said Murray was bitten during the scene when his character lets the groundhog drive a truck.
2. Despite what it says in the script, the film was not shot in Punxsutawney, Pa.
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