Sometimes when I edit OSM, the bus relations gets disconnected or tangled.
Is there any way to see or find these relation errors at a glance?
Here’s one option:
http://ra.osmsurround.org/analyzeRelation?relationId=186670
(substitute your relation number instead of 186670 there)
and to see a map:
If bus relation is PTv2, than you could check them on OSMI service: OSM Inspector | Geofabrik Tools - green one are correct, black one need to be updated.