Misaligned boot lid could be because the car had a bump in the past, been badly repaired or not set properly after repair, or the doors just twisted by being forced close with an obstruction in the way, or seizing hinge one side, or it could be something as simple as a missing rubber buffer stop on one side, easy to replace?
The gutter trim just clips back into place, better if you heat it up with a hair dryer to make it more supple, you could use some suitable contact adhesive to hold it if it doesnt want to stay.
And difficulty in reverse gear selection can be a binding clutch plate that doesnt completely disengage when the pedal is depressed.
This can be because theres too much carpet/mat stopping the pedal going right to the floor.
Oil on the clutch plate causing it to drag.
Too high an engine tickover speed.
Worn, stretched or incorrectly set gear linkages.
A worn or fault in the clutch release bearing.
Worn gearbox internals.