You can file a counter claim through Youtube:
https://support.google.com/youtube/answer/2807684?hl=enGenerally this should be done under advice of an attorney, because these counter notices set a ticking clock of ten business days during which the copyright holder must either sue the Youtuber for copyright infringement or the complaint will be cancelled. Not all Youtube claims related to copyright are counter claimable. There is a tendency among people to misjudge their actual risk and whether or not they infringed, so it is unwise to file these counter claims without advice from an attorney.
You can also file in your local jurisdiction for declaratory judgment if you receive a formal cease and desist notice, and if that C&D contains false claims then the plaintiff may be in trouble. A truly false and malicious DMCA claim can be countered with a defamation lawsuit as well.
You can also sue someone for any reason ("It's Tuesday! I hate you! I'm suing you!") at any time, but that doesn't mean that you will win.
Using short clips of the trailer for review purposes is clearly fair use. Often times, however, Youtubers think fair use protects them more than it actually does and do go overboard such as taking entire TV episodes and commenting over them. However different judges have seen the issue differently in different situations. So, if you really did infringe, but think you didn't, and file the counter claim, you are doomed, and copyright law is very generous to victorious plaintiffs.