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Revealing: When Stan reverses the bus into Blakey's minivan, crushing it, the van that is crushed is not the same one that is used earlier in the film as it is tatty and has a different grille. Also, the bus parked behind which the van is crushed against is so obviously fitted with an extra panel, to prevent body damage when the van is pushed into it.
Other: When Stan is towing Arthur's motorbike and sidecar behind the bus the tow rope was attached to the handle bars, when the handle bars come off, the bike naturally breaks away from the bus and rolls off on its own, but it is going back the way it was when it was being towed. The bike couldn't have turned 180 degrees with no handle bars to steer it.