When the rear of the van is shot, one of the doors falls off as it rounds the corner and the van is trailing smoke. In the next shot looking back there is no door on the ground and no smoke. In the next shot both rear doors are missing.
One of the Visitors, Klaus, has a scar on his "face"-- a face which is actually (in universe) a mask covering his actual (reptilian) face. Visitors whose "faces" are damaged simply replace them; there would be no legitimate reason for any visitor to have such a scar. If it were an attempt to look more impressive, it would be wasted (if not counterproductive) since everyone knows that the "faces" are masks.
Klaus character has a scar across his face. Since he is a lizard the scar is just a part of his mask making it a vanity item.
Everyone outside of Elizabeth's small circle of friends refers to The Starchild as being 8 years old. However, she is really only 2 years old -- and they should know this, since it has only been 2 years since the aliens arrived on Earth. Even though she looked like it until she morphed again, she couldn't possibly be 8 years old.