I am absolutely sure, this was documented in he late 90s/early 2000s. For example, the IMDB trivia (which has been there for years):
The Region-1 DVD actually contains two different versions of the film. The fullscreen version is the theatrical version, the widescreen version has one brief shot replaced. It is a small scene near the end at 1:14:06 just before Batman fights the Joker in the Clocktower. In the fullscreen version Vicki Vale gets a disgusted look when she kisses the Jokers jacket and pulls a lint out of her mouth, however in the widescreen version she really seems to like it.
In 2001, someone else on another forum said this:
on the DVD version, this shot is replaced with her still kissing the jacket, but she no longer looks disgusted, nor does she pull out the lint. In fact, she kinda looks "into it," for lack of a better word.
From Home Theater Forum in 2004:
on the widescreen side of the Batman DVD, the scene at the end where Vicki Vale is kissing the Joker's jacket and pulls lint off of her tongue, is changed slightly. I think it shows more kissing and she doesn't pause to remove the lint. The correct theatrical footage is on the pan 'n scan side.
And the widescreen version on the 1997 DVD was anamorphic, so unless it was an upscale, it wouldn't have been the LD master.
And from where comes this presupposition that all WB launch titles were from LD masters? I'd buy the fullscreen sides being dumped from LD, or maybe those notorious full-frame-only releases like Caddyshack, Vacation, Fierce Creatures, et. al., but I thought the anamorphic releases were supposed to be demo discs for the format, wouldn't they have thus been new masters made specifically for anamorphic?
I also can't find any mention of the "no lint" version showing up on any widescreen LD. But it most definitely was on the original widescreen DVD.
And back in 2005 someone on a forum said they had just seen a 70mm print with the same "no lint" version - I don't think they'd be making it up or misremembering. So this could have been a situation where the 70mm version was different due to the film being changed after the supposedly-locked "final" cut was sent out to the lab for blowup, much like the first cut of ESB with fewer establishing shots of the Rebel fleet, or "Star Trek: The Wrath of Khan" with no Roman numeral "II". And when the DVD master was done, WB could have accidentally pulled an IP that reflected the 70mm blowup cut.