When Number Six is captured when he rides a horse out of Harmony, there's a red handkerchief suddenly tied around his hand. This handkerchief is first put on in a later scene.
Toward the end #2 is driving one of the Mini Moke taxis. The license plate on the front (HLT709C) is a regular British plate, not the usual Village ones that just say "Taxi".
The camera's shadow is visible while it pans across the horses as Number Six walks to the stables.