Factual error: Sailing ships in harbor always have their sails furled and stowed, not set. All the ships in the city's harbor have their sails set. Would never happen.
Other mistake: In the boat scene, when Eugene takes out the lanterns, Rapunzel is moving way too fast compared to before and after.
Continuity mistake: In the reprise of Mother Knows best; Mother Gothel gives Rapunzel Flynn's satchel containing the crown in order to try and prove his disloyalty. Rapunzel then gives this to him on the boat later. However, no-one carries the satchel from the campsite to the boat! Rapunzel and Flynn are not carrying it, and Maximus does not have any saddle bags. How does it get from A to B?
Chosen answer: They surely clobbered him badly enough that he fell unconscious, and he didn't wake until the guards saw him. Also, they tied him up in the correct position and gave him a good push.