How can you tell if your window tint is on the inside or the outside?

Yea if done correctly it should be on the inside, but the only real way to know if you're unsure is to remove the window. There's tint removal spray to make the process a lot easier and it only cost about $5 so you can spray one side of the window and see if you can remove the tint, if not try the other side.

I've always found (maybe I'm just gifted) it's really easy for me to get car windows out, to either deep-clean the glass, tint the windows (I do a perfect job with quality film, I do it in the bath-tub) or to repair the window frame or replace cracked glass. Check your manual for removing it on your car, and remove and maybe re-tint the window. Ebay have a lot of film, go for the quality stuff.

if done correctly the window tint should be on the inside of the car

there is no way of really telling unless you remove the window

well i dont think you can exactly tell..look at the edges of the glass see if you can noticed the layer