That was one of my biggest irritations as the picture has gotten clearer over the years. That, and I think the windscreen in the truck in the drainage canal bothered Cameron just as much as it bothered me. A minor continuity error that was easily fixed. Too bad several others aren't as easily remedied (like when Arnie drops his pistol to pick up the tear gas launcher after the SWAT shootout, but has it to shatter T-1000 in the steel mill). Also, they finally covered up T-1000's junk in the arrival scene with the added bit of concrete. That was getting WAY too obvious as the picture quality improved.
Although, Arnold's dong flopping around in the arrival in T1 is still present. Now that I think about it, it goes along with all the other intentional symmetry of the two movies. The unintentional symmetry of both bad guys having clearly exposed genitalia upon arrival.