Are there any "tools" that I could use to help identify mistakes in my family tree?
"Family Tree" of 'FamilySearch', itself, has mechanisms to identify possible errors/mistakes/anomalies.
The errors/mistakes that "Family Tree" of 'FamilySearch' identifies will appear on the 'right-hand-side' of an individual's/person's "Person/Details" page/screen, under the TOP Section, being "Research Help".
"Research Help" identifies many different sorts of possible errors/mistakes/anomalies.
That said ...
NO "System" is, Perfect; or, 'foolproof' ...
SOME possible errors/mistakes/anomalies WILL be missed by the "System" ...
[ But, that said, the "System" is pretty good; but, certainly, NOT perfect ... ]
Sometimes one must just look diligently through one's "Ancestral" lines; and, assess things for themselves.
Here is a "Knowledge Article" in 'FamilySearch'
What are research helps in Family Tree?
How do I fix data problems in Family Tree?
I hope this helps.