When young Gia writes in her journal, she's right-handed. But older Gia is a lefty.
As Gia begs Linda not to leave, the first shot from behind shows her fully nude but from the front she can clearly be seen to be wearing underwear.
When Gia kicks her mother out of her apartment, she throws her bags all over the hallway. Her mother assembles some bags by the elevator and waits. In the next shot, the bags are rearranged, and her mother is holding some of them, though only a few seconds have passed.
When T.J. is at the hospital to see Gia, he gets upset and slams a chair down about 3 or 4 times before putting the chair back. When he lets go of the chair, it comes to rest in such a way that you can tell that at least one of the back legs of the chair is broke. The camera cuts away to Gia and when it cuts back to T.J., the chair is back to normal height and position against the wall under the window, just like it was before he smashed it.
The letter "G" that Gia carves on the receptionist's desk.
When "Gia" is at the hospital and firsts learns of her condition, she is asked if she has heard of "acquired immune deficiency syndrome" (AIDS). "Gia" says no, but the real Gia has been quoted saying, "I'm sick, I don't feel good, I don't have anywhere to go ... I think I have AIDS."
Angelina Jolie has several tattoos, while the real Gia had none.
Gia and another model are seen riding a 1997 Harley-Davidson Heritage Springer in 1985.
Camera used in the first shooting session is Olympus OM-3. It was produced only for 3 years and wasn't available until 1983.
Incorrectly considered a goof. Gina talks about having AIDS, but later at hospital When asked if she has heard of "acquired immune deficiency syndrome" she says "No". In the early days people were far less aware and it's quite understandable that she would not have realised what AIDS stood for.
Angelina Jolie's tattoos are clearly visible including her famous dragon tattoo on her arm where she would later add "Billy Bob" for Billy Bob Thorton.