Vincent the bear spent the whole summer gathering food to survive, but he is portrayed as a bad guy for threatening to eat RJ if he didn't replace it once he accidentally destroyed it. They seem to have realized this during the production and added in a line about how Vincent got to where he is by selling out, betraying, murdering, etc. all of his former friends and another line where he praises RJ for being just like him once he sells out his friends. Not to mention that, you know, the time RJ visits him is at the start of spring, making the size of his foodpile a bit weird (how much did he stack up on if what RJ destroys is what's left after winter?) and giving Vincent more than enough time to fill up his reserves for the next winter himself even though punishing RJ for destroying his food was justified.
Gladys Sharp is definitely not a nice person. With that said, it's hard to fault her for calling the exterminator since the animals were vermin that were making a mess of the neighborhood with their constant raids.
Fridge Brilliance: The Hedgies' plan to defeat Vincent, Gladys and Dwayne hinges on tricking Vincent into jumping over the hedge, setting off the Depelter Turbo in Gladys' yard. Over the Hedge.
Fridge Horror: Vincent's line about how he and RJ are "two of a kind" and how he got where he is by hurting people may seem out of nowhere. However, remember that Vincent stole the food he originally had; he is, for all intents and purposes, a thief. Vincent also had a massive foodpile at the start of spring, when his hibernation period has ended; he had stolen more food than he possibly needed. Bears, when raiding food from humans, have been known to seriously injure, or even kill, people; Vincent has harmed others for the sake of his own greed.
Launcher of a Thousand Ships: RJ, who has been paired with nearly every major character, most notably Heather, Stella, Ozzie, and Hammy. Most noticeably, he seems to constantly flirt with Verne in the movie. It's probably the closest to being canon in both the comic strip and the film.
Moral Event Horizon: Gladys crossed it when she called Dwayne in to deal with the animals, especially as it's obvious she just wants to kill them.
If Vincent didn't cross it when he attempted to kill RJ for getting his stash destroyed, he did when he came after RJ at the end and even tried to attack the others.
RJ: They always got food with them. We eat to live - these guys live to eat! Let me show you what I'm talking about! The human mouth is called a 'piehole', the human being is called a 'couch potato'. (signifies telephone) That is a device to summon food. (signifies doorbell) That is one of the many voices of food. (signifies front door) That is the portal for the passing of food. (signifies many delivery trucks) That is one of the many food transportation vehicles. Humans bring the food, take the food, ship the food, they drive food, they wear the food! (signifies grill) That gets the food hot! (signifies cooler) That keeps the food cold! (signifies turtle pinata) That...I'm not sure what that is. (kids break the turtle piñata and Verne yells) Well, what do you know? FOOD! (signifies table where family prays before dinner) That is the altar where they WORSHIP food! (signifies advert for Seltzer) That's what they eat when they've eaten TOO MUCH food! (signifies treadmill) That gets rid of the guilt so they can eat MORE FOOD! FOOD! FOOD! FOOD! FOOD!FOOOOOD! So, you think they have enough? Well, they don't. For humans, enough is never enough! And what do they do with the stuff they don't eat? They put it in gleaming silver cans, just for us! (knocks over a trash can) Dig in!
They Wasted a Perfectly Good Plot: While fans of the strip mostly liked the film, a few were disappointed that some of its more quirky aspects (such as The Tree That Knows Stuff) didn't make it in.
Viewer Gender Confusion: The porcupine triplets. Out of the three, only Spike has a confirmed gender (Penny and Lou refer to him as "he" when talking about how the triplets kept waking their mother). Bucky, due to the male name and the male voice actor (actually played by the son of the director, Sami), is most likely also male. The last triplet, Quillo, is ambiguous. The name doesn't really have any implied gender, Quillo is voiced by a girl, and the triplets are always referred to as "kids", which could imply that at least one of them is a girl.
The final boss. It's completely stationary, has an easy-to-hit weak point, and is aided by enemies that aren't likely to pose any sort of threat.
The Depelter Turbo. The movie version was hilariously powerful, while this one can be defeated by a few special attacks to its fuel source. It doesn't help that most of the Depelter's stronger attacks hit its front, while its weak spot is in its back; chances are, it won't even land a meaningful hit.
Any enemies who use fire attacks, like rats with fire guns or grills. Getting set on fire means your character will run around helplessly, while you can only try to avoid running into more hazards. You'll lose at least two hit points if a fire attack connects; god help you if you get hit near a laser grid.
The Mecha-Mooks with spinning blades. They're not so bad if you have room to maneuver, but in tight spaces like the train and mini-golf course, they can easily pin you against a wall and hit you repeatedly. When that happens, you can't do anything other than wait for it to power down and then try to fight your way out, but you might not destroy it before it starts up again.
Hilarious in Hindsight: At one point in the game, Heather, the porcupine kids and Vincent watch Shrek SuperSlam gameplay, with Heather in particular pondering why it's not played competitively. With there being actual tournaments for SuperSlam now, this particular line is all the more hilarious:
Moles tunnel all over the place and pop up to throw bombs at you. They're not any more dangerous than most enemies, but they're an utter pain to track down and defeat. Thankfully they only appear in a couple of levels, but one has you fighting them inside a laser grid hooked up to flamethrowers, where one slip-up can result in a lot of unnecessary damage, and another is a Timed Mission where a mole can waste a lot of your time by harassing you repeatedly until you take it down.
Chipmunks. They move way faster than you can and have a rapid-fire ranged attack that can keep you at bay long enough for them to start moving again. Expect to do a lot of chasing if you encounter one.
Good Bad Bugs: Replaying one of the missions in the DS version lets you skip the final mission set.
No Problem with Licensed Games: The non-handheld game is surprisingly good. It's a hack-and-slash with no real major flaws. It also has a lot of diversity in the missions. Also, unlike most movie licensed games, the story isn't a butchered retelling of the movie's plot. It actually acts as a sequel of sorts, and while the story is no masterpiece, it's good enough to keep you interested the whole way through.
"Don't fall off the mountain" in one of the levels leading up to Vincent's cave. It's very easy to fall, especially with enemies pushing you around.
"Don't fall off the platforms" in one of the amusement park levels. The fixed camera angle doesn't help with the precise coordination you need to pull off those jumps.
"Don't set off a trap" in Mission 22. Dodging the circling lasers the first time is easy enough, but then you have to do it again while a wave of gophers is trying to kill you. Then comes a narrow passage of moving lasers while rats with freeze guns shoot at you. Screw up once, and you'll have to do the mission over.
In the last house heist level, "Collect all the lost items and chips before the time runs out". You'll need to replay this level several times in order to map exactly where everything is, and collecting everything requires very precise pathfinding and timing. It doesn't help that Rufus has an entire animation he needs to do before he collects something, which he may not finish before the time runs out.
The penultimate level. It comes in two parts: the first has the player(s) traversing a hallway thoroughly covered by motion sensors and security cameras (which cause damage if triggered) to clear out four rooms of enemies, in order to activate an elevator. The second part is the elevator ride, which involves dodging an increasingly complex laser grid which, if triggered, will send enemies to kill you. Both sections are long, arduous, and will likely involve taking a lot of damage with not nearly enough healing to go around. And finally, screwing up one segment means having to start it over.
Level 4, "Projector Heist", for the gauntlet of traps at the beginning of the level. You'll likely be either stumbling into hazards trying to fight enemies, or get hit repeatedly by enemies while trying to sneak past a motion sensor (which will then result in setting off the motion sensor and taking more damage).
That One Puzzle: The minecart puzzle in the amusement park. You have to jump across a series of small platforms, hit a switch, and then jump back. It requires a lot of very precise jumps, which isn't helped by the camera being fixed at an awkward angle, and if you fall off, you take damage and have to start from the beginning.
Unwinnable by Mistake: In the "Defend the Woods!" level, you have to use the combined special attack at least once, or the level fails to end even after all the waves of enemies are beaten.
What an Idiot!: At one point, Ozzie, apparently so determined to show how good he is at faking his death, walks into oncoming traffic. Amazingly, he survives, but the wagonload of goods is scattered across a nearby yard, forcing the other animals to gather it all up.