First of all, anamorphic discs do sometimes have the black bars, just not as big as the 4:3 would, because the film aspect ratio is not always 16:9, it may also be ~2.5:1. That being said, the Dr.Gonzo set does have black bars also, just not as wide as the TR47 set.
One good way to see if it is anamorphic or not is to capture a frame with a player and see it's aspect ratio.
Secondly, in my experience, if someone does not know which version he has, he most definatelly has the Gr.Gonzo set.
And last, the versions that have easter eggs IIRC are: a)Dr.Gonzo b)EditDroid (only the ANH disc) and c)Isomix.
Isomix does not have a commentary track, and EditDroid hasn't been around for so long, so there is only one logical conclusion...