Theo tells Vincent at the hospital that he is now married. In reality Vincent received a letter from his brother on Dec 23rd 1888, in which he announced his engagement. Vincent feared that his brother would not be able to support him, once married. Additional to this he had the argument with Gaugin that night over Paul leaving. Mentally disturbed by all this he cut his ear off.
At approx :35 into the movie, van Gogh is lying in a hospital bed after being beaten up. The end of a pillow at the right hand side of the image shows a 21st century soft goods tag.
During a moment when Vincent is walking through the fields, there is a wheel track from a four wheeled tractor in the plowed dirt. You can see the two smaller front wheels and the two larger rear wheel tracks in the dirt. The first motorized tractor was built in Iowa in 1892. Vincent died in 1890.