Can't speak to the 71 models. Don't know if the car had a tail panel logo if it didn't have tape stripes in all cases. Just looking at the metal logos, I think that there was no Demon logo on the tail panel. When I got my 72 Demon it had the factory side rub strips and did not have a logo on the tail panel. With stripes, it had a tape Demon logo on the tail and both front fenders. Without the tape stripes, it had metal logos on the front fenders.
There is a small DODGE logo in block letters on the driver's side of the hood. The E is close to a vertical line drawn from the inside of the turn signal molding in the grille. There is a similar logo on passenger side of the trunk with the first D located on line with the inside of the red tail light. On the 72s these were plastic and secured to the body with an adhesive.
Hope this helps.