- Can't Un-Hear It: Nolan North as Raphael is seen by many as the best Raphael voice by fans.
- Cliché Storm: As pointed out by CinemaSins here, the entire premise of the movie is this.
- Continuity Lockout: Karai's presence in the film is not explained, and the film doesn't take much time to explain her significance aside from working with the Foot Clan and the fact she's currently their acting leader. To explain, Karai is basically the Shredder's first and most primary enforcer, and her major defining quality is her Undying Loyalty and honor, and takes over the Foot Clan in the comics and 2003 show after the current acting Shredder died.
- Cult Classic: While this film is one of the less popular works in the franchise, it still has a dedicated following.
- Ensemble Dark Horse:
- Despite her relatively small (and unexplained) role, Karai was well-received as the first appearance of the character on the big screen.
- Raph's Nightwatcher persona was wildly popular for being just plain badass. Many fans have been hoping to see the persona return in recent and future incarnations of the franchise.
- Harsher in Hindsight: One of the film's major plot aspects is the family potentially falling apart, with Leonardo and Raphael's fight nearly ending with the latter killing the former, before Raphael runs off in horror at what he almost did. The 2012 cartoon series would later make Hamato Yoshi and Oroku Saki brothers (Saki having been adopted by the Hamato Clan after defeating the Foot Clan), which ends in misery for everyone involved.
- Ho Yay: One of Donatello's phone calls that truly gets crap past the radar: "No, I'm not playing hard to get. I'm telling you, sir, it's not that kind of phone line!"
- Hilarious in Hindsight:
- General Aguila, more or less the leader of the Stone Generals, is the Big Bad of the movie, and played by Kevin Michael Richardson. He would go on to play The Shredder five years later.
- Raph says "I don't feel so good." What makes it funnier is that Chris Evans acts as Casey Jones. And of course, Winters in the end gets dusted off, much like victims of Thanos.
- James Arnold Taylor (Leonardo) and Mike Kelley (Michelangelo) both voiced Ratchet the Lombax. Putting things in full-circle, the director, Kevin Munroe, would later go on to direct the Ratchet & Clank movie.
- So Okay, It's Average: Though this film is in the canon of the live action movies, it's unfortunately one of the most forgettable as well, to the point where some DVD collections don't even include this movie in them.
- They Wasted a Perfectly Good Plot: More like wasting a hinted plot. The Sequel Hook has Karai suggesting the Turtles will have to someday face the return of the Shredder, which fans probably would've preferred to being the actual plot instead of the one we got.
- Unintentionally Unsympathetic: Its difficult to feel sorry for Splinter when he laments his family falling apart since he was the one who sent Leonardo away for leadership training in the first place (by himself no less) and forbade the other brothers from getting involved with crime-fighting while Leo was gone, making the whole situation come off as his own fault. He never even acknowledges his involvement and instead lays the blame on his sons.
- What an Idiot!: A lot of trouble could have been avoided if Winters had just told the Generals Who Wants to Live Forever? earlier instead of just telling them not to question him.
YMMV / TMNT