These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Misblamed: There have been fans complaining about Mikey and Gus's "new voice actors" in the film. Both of them has the same voice actors they did in the show- though at this point, Courtland Mead's (Gus) voice was beginning to break, and Jason Davis' (Mikey) voice had already broke. The only member of a gang with a new voice is T.J.
Replacement Scrappy: King Freddy II is this for fans of King Bob. Though he's seen as this in-universe.
Meta example: A lot of Recess fans hated Myles Jeffrey's portrayal of T.J., due to his voice being too high and lacking the spunk Ross Malinger and Andy Lawrence gave him previously.
T.J.: Sure, being a kid can be tricky. You're growing all the time, things are always changing, but no matter how much things really do change, I figure as long as we stand up for what we believe in, and stay true to ourselves, everything will be alright. (Bell rings) And who knows? Seeing as how we've made it through so much already, I've got a feeling this might be our best year yet. (Miss Finster begins to close the doors) Really, I mean it! (Miss Finster shuts the door)
Another thing to note is that in the theme song, the part where T.J. waves at the audience was seen as a "Hi" to them as they join the gang for another adventure. At the end of the film, the wave could be seen as a "Goodbye", as the show was now officially over.
The movie's timing can be seen as a contributing part, as the original target audience who were in elementary school when the show came out in 1997 were now in middle school (and for some, high school) when this film came out on video and DVD. They grew up seeing T.J. and his pals go on their adventures, and Taking the Fifth Grade could've been seen as the point where childhood ended.