I found a few trees that may be an issue.
Field 38: NE corner has a tree half in the field (right on the corner @ 2459, 1323) and one next to it fully in the field (2458, 1330)
Field 72: A minor one, but can be annoying. There's a tree outside the field where it comes to the point (1762, 15) that makes it so even a relatively small-ish (6.5m) implement gets stuck between that tree and the collision field for the border of the map. It's not major as you can take the tree out if you own the land obviously and it only prevents a VERY small section from being done if you're doing contract work on it so no issues finishing it.