Continuity mistake: Forydize says the Tremble has a 1965 Rolex Oyster Perpetual. Q gives Tremble a replacement that is meant to be the same, but with the radio and TV screen built in - Tremble says that he cannot tell the difference between the new watch and his original. But when a closeup of the new watch is seen, it is not a 1965 Rolex Oyster Perpetual. (00:58:55 - 00:59:45)
Continuity mistake: After drinking the drugged champagne Tremble collapses the instant he enters the bathroom. But when we see him passed out against the bath he doesn't have his braces and holster on. They're hanging over the side of the bath but there was no time for him to have taken them off. (01:26:30)
Continuity mistake: There is a hat on top of Jimmy Bond's piano. The strings hanging from it change position between shots. (01:56:15)
Continuity mistake: After Mimi has been locked in her room, she rushes to the window to escape. In the interior shot, the window has one blind that is just the width of the center pane of glass. In the exterior shot there are 2 blinds which, together, cover all 3 panes. (00:28:50)
Continuity mistake: When Miss Goodthighs comes in with a champagne bottle Tremble shoots and she says 'missed Mr Bond'. At this moment Tremble has no glasses. A few seconds later he says 'raise your arm' and then shoots at the bottle. He is now wearing glasses.
Revealing mistake: The Union Flag pinned to the back of the taxi driver's jacket is upside down. Since he is part of the government (he's undercover for the Foreign Office) he shouldn't make such an terrible mistake. (01:20:40)
Continuity mistake: When James gets in the bath, there is a lot of foam behind him and on Buttercup's arms. The camera angle changes and all the foam has gone. (00:18:05)
Revealing mistake: Mata is kidnapped and taken to Casino Royale in a flying saucer, which then releases a small hovercraft to bring her inside the island cave. Once inside the cave, the hovercraft leaves the water and goes up a ramp, at which point a tow cable can be seen pulling the hovercraft up the ramp and onto the landing platform. (01:45:25)
Continuity mistake: When the Secret Service car comes across the lions on the road, both their number and positions shift between shots.
Revealing mistake: During the saloon fight, when a cowboy blows his trumpet, the hole that the arrow later passes through is already visible.
Continuity mistake: When Vesper is lying on the bed taking pictures, her light pink robe suddenly appears dark pink in the very next shot.
Visible crew/equipment: When Le Chiffre levitates the woman, after he conceals her hand, the metal rig used to lift her becomes visible in the top right corner of the screen.
Visible crew/equipment: When the truck crashes, a filming camera is visible on the left side of the frame.
Visible crew/equipment: Before Bond and Vesper walk through the secret door, nothing is cast in front of it. However, once the door closes behind them, a shadow - presumably that of the cameraman - is cast on it.
Visible crew/equipment: When Bond is arrested by a group of men, one of them carries a silver shield on his back, which reflects the set lights. (01:50:45)
Revealing mistake: When the UFO releases the hovercraft, vertical creases are visible on the blue-sky backdrop behind it.
Visible crew/equipment: When Bond reveals the coffin containing the toupee, the stage lights are reflected on the glass dome to the left.
Visible crew/equipment: When Mimi slides down the pipe, her safety cable is visible. (00:29:29)
Continuity mistake: While Sir James and Hadley are standing beside the map, Bond asks about his namesake. When Hadley provides an update, in the shot facing Hadley he's holding up the mini flag with his left hand, but in the next shot facing Bond the mini flag is being held up in Hadley's right hand. (00:38:35)
Visible crew/equipment: When James is visited in his chambers in the Scottish Castle by the "widow", someone is in the mirror as she enters. When she moves forward, and the film cuts back to her from James, the person is no longer in the mirror, even though the angle is the same.
Answer: Given that this is a comedy, the thinking was probably "Well, we'll just blow up your retirement so you've got no choice but to come out of it."
Captain Defenestrator