When Brian Equator shoots Victor in the Visitors sketch with a Webley Mark V, he fires away from him.
When Arthur Name gatecrashes the dinner, he puts on a record and turns the volume knob anticlockwise which would be turning it down, but the volume goes up.
On "The Lumberjack Song," when the Mounties echo the last verse, some of them can be heard to sing "I cuts down trees..." when it should be "He cuts down trees..."