General:
* The snag: Implies a problem or obstacle.
* The drawback: Similar to "snag," but focuses on the negative aspect.
* The downside: Another word for a negative aspect.
* The hitch: Suggests a minor problem or complication.
* The caveat: A condition or qualification that must be considered.
* The fine print: The details that might be hidden or overlooked.
Specific to catching something:
* The grab: A quick and forceful capture.
* The capture: A successful attempt to catch something.
* The hook: Something that attracts or catches attention.
Figurative:
* The twist: An unexpected or surprising element.
* The kicker: The most important or interesting part.
* The rub: The difficult or problematic aspect.
To give you the most accurate synonym, please provide the sentence or context where "the catch" is used.