Continuity mistake: In the scene back at the park with the huge skeleton the kids are playing on, Gus talks about how he wants to be remembered and Hazel gets angry with him. During this scene, about every cut shows Gus having his head in a different position than in the previous shot.
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Factual error: When Hazel Grace goes to the hospital with fluid in her lungs, her monitor shows she has 97 percent oxygen saturation. Even after the fluid was drained from her lungs and regardless of her being on oxygen, given her disease and diminished lung capacity, her oxygen saturation would have not been as high as that.
Continuity mistake: After Gus is discharged, Hazel takes him to the park, Gus displays his disappointment over not being able to have much of time to live, and Hazel lightens him up, her hands covering her knee caps. Gus bends over on to Hazel's side to take the bottle of wine and as he takes charge of it, Hazel is seen with a glass of wine that wasn't present initially.
Continuity mistake: When Hazel is given the blue dress by her mother in Amsterdam, her mother puts it near the bottom of the green dress she is lying on the bed, but in the next shot the green dress is to high for the bag to be at the bottom of the dress. This happens a few times after it as well.
Add timeLinda Smith
Visible crew/equipment: This mistake occurs during the pre-funeral scene. When Isaac is at the podium, they occasionally show a shot from over his shoulder where you can see Gus and Hazel. All the way to the left of the screen, there is some sort of black object that looks like something that holds cords on the floor. This object disappears by the time Hazel gets up there.