Around 2 years ago, I posted this little thing I noticed on the tag of a pair of booty What the @prod dunks...I posted it and I got around 600 DMs because of it and then my account got locked down for nearly 2 weeks.
Take a look at the date separator between the first 2 in the product code (BQ4822) - notice on the fake pair it's not touching, on the real pair it is touching. That's usually the FIRST thing I look at on this new style fakes.
This isn't true for ALL shoes but it's true for some. Just a neat little puzzle piece IMO.