They've gone to a lot of trouble with that illusion. At 33.53 you can see what looks like a 'normal' rego plate, but if the image is reversed to make the HX look LHD, then the plate must have been printed in reverse.

Also the aqua-coloured 67 Impala hardtop, must be a RHD conversion because it appears to be LHD in the same reversed film as the HX. Its LHD wipers are still there, which were not changed in the conversion (so they appear to be correct for a factory RHD).

Dr Terry