When Sid is shot and Bob is helping to bind the wound, they both begin to tie off below the wound, instead of above it (between the wound and the heart, in order to constrict blood flow). When we next see Sid's leg, the wound is bound correctly, above the wound.
The Pontiac LeMans central to the story is a 1964 model, not a 1963.
Mr Reich claims to have doused Vernon with propane and roasted him in a motel room but when propane is decompressed and introduced into any atmosphere warmer than -43°C (-45.4°F) it instantly evaporates