When Loki and Thor first meet up on Sakaar, Loki reveals that he's been there for weeks and yet despite this, Loki is somehow completely unaware that Hulk is also on Sakaar as shown by his reaction in the battle arena. This seems incredibly unlikely considering that not only is Hulk a huge celebrity there, but also that Loki had gotten in good graces with the Grandmaster. Surely he would have found out who the champion is. His likeness is even featured atop the Grandmaster's tower.
The goof item below may give away important plot points.
When Hela's blade destroys Thor's eye, she strikes the side of his head with a horizontal slashing motion. For such a blow to completely destroy a human eye as shown, it would leave visible cuts on one or both sides of the eye socket. (Given that Asgardian heads and faces externally appear identical to those of normal humans, there is no reason to believe that their skulls do not have the same bony structures around the eye sockets as do those of humans.) The wound shown when Thor turns to face the camera has no such cuts, but instead is characteristic of a stabbing blow into the eye.