Activate Stalking Mode
One infuriatingly large plot hole that fans of the first GOTG movie take exception to is how Drax met Gamora in the prison scene. Drax just happens to appear out of the clear blue skies, so to speak, and starts divulging information about his past. Even the other prisoners were surprised by Drax’s sudden appearance.
However, keen-eyed viewers found the answer lying in the background of an earlier scene. As the other prisoners drag Gamora out of her cell, you can see Drax overseeing what’s going on from the upper floor. That would explain how Drax showed up just in the nick of time. Plot hole averted.