Plot hole: "Sight Unseen": Wells has the key to Lori's shackles. Weston, who knows this, knocks Wells out, but instead of taking his keys, uses a completely unnecessary (and considerably more difficult) set of bolt cutters to break the leg cuffs. (00:32:30)
The Invisible Man (1975)
1 plot hole - chronological order
Starring: David McCallum, Craig Stevens, Melinda O. Fee
Continuity mistake: "Man of Influence": The invisible Weston follows Geed into the parlor. When the door closes, there's no key in the lock. Then the shot cuts to a close-up of the door, and a key has appeared there, just in time for Weston to turn and lock it. (00:40:40)