Allegedly Free Game: It claims to be free to play, with perks for subscribers. Of course, those perks include the ability to venture out of Toontown Central and its three streets, to learn more than the first four levels of Gags (attacks) of the two starting Gag tracks, buy clothes for your Toon and furniture for your house (among other things) from Clarabelle's Cattlelog, play games other than the few Mini Games in the first Playground, and so on.
And buy items for friends.
It had gotten a lot better with this - free accounts allow you to go anywhere (however, you can't buy anything outside of Toontown Central), use Speedchat Plus, buy from the Cattlelog and have up to 50 friends. Unfortunately, free users can't go into Cog Buildings or buy stuff outside Toontown Central.
Now that Toontown is closing, all Toons can now buy stuff, go on missions to all the areas, fight Cog bosses and wear items.
Always Accurate Attack: There are S.O.S. Toons who can make it so that the next round of the Toons' attacks hit. There is also an inverse where some S.O.S. Toons make it so that the next round of Cogs' attacks miss.
The entire Drop Track in general. While they are second only to Trap Gags in terms of damage done, they have the lowest base accuracy of any gag track. Unless you have a friend who is simultaneously training Squirt Gags (very high accuracy), you're gonna be gag camping for a looooong time.
Awesome yet Practical: When you are all alone in multi-Cog battles, Lure Gags are your best friend since they put the affected Cog to sleep.
Bad Boss: Bossbots. You can even use their Pink Slips to fire Cogs.
Ballroom Blitz: Not necessarily a ballroom, but the C.E.O. battle is supposed to be a sophisticated and well-mannered meeting about golf or plotting the toons' defeat. Until you sabotage his plans by making the guests explode with bad drinks...
Breakingthe Fourth Wall: One of a Legal Eagle's sayings when it uses the attack "Legalese" is "The opinions of this attack are not those of Disney's Toontown Online."
Bribing Your Way to Victory: Parodied with the Cashbot Promotion track. Once you have the Cashbot Disguise, you have to get a certain number of Cogbucks (by beating Cashbots or taking over the Mints) to see the C.F.O. for a "promotion" (aka fighting him).
The lure gag track consists of fake cogbucks used to make cogs come closer to the user For Massive Damage if you want to use another gag or to leading them into a trap or to temporarily stun them.
But Thou Must: Not only do you have to do all of the non "Just for Fun" Tasks in each Playground before the game sends you to the next one, there are several points in the game where it's very easy to end up in a Playground with only a single, very difficult Task, unable to proceed. The first obvious spot would probably be Daisy Gardens where you have to get a key from a Cog species found only inside buildings, but the exact Cogs you face in each building is random, and that species is quite rare at the levels of the Toons that would be going for the Key.
Chekhov's Gun/Hobby: When you play the minigames, there is one minigame where you have to shoot yourself out of the cannon and aim yourself into a big tub of water. Later in the game, when you fight the CJ, guess what you have to use?
Similarly, the 'treasures' that heal you in the main playgrounds reappear in the CFO battle and the golf course in Chip n' Dale's acres reappear in the CEO battle.
Chokepoint Geography: If you don't have teleport access to an area in Toontown, you can only get through there by walking.
Same with the Cog Headquarters, since you can't get teleport access there.
Color-Coded for Your Convenience: The four types of Cogs have distinct logos and clothing colors that you can easily tell apart. About the only way you can tell a Short Change from a Cold Caller at a distance (see Palette Swap below).
Combat Medic: In most boss battles, there will usually be one person who has stocked up on a lot of Toon-Up gags or Toon-Up and/or Gag-Up phrases to help.
Damn You, Muscle Memory: Toontown has a relatively unusual control scheme. Movement is arrow keys only (as opposed to arrow keys or the WASD keys in some other games), and you don't press any specific key to start chatting, just start typing. If you've been away from the game for a while, you may end up typing long strings of characters when you're trying to walk around. Jumping is also different, with the Ctrl key instead of spacebar.
Dance Party Ending: When a battle finishes, the surviving Toons dance while gag experience and Toontask updates are completed.
Extended Gameplay: Beating all the toontasks in the Toon neighborhoods unlocks the Cashbot suit toontasks. Beating that unlocks the Lawbot suit toontasks. Beating that unlocks the Bossbot suit toontasks. Beating that unlocks quite a few "Just for Fun!" toontasks
Fake Longevity: The "Just for Fun!" toontasks allowed Toontown to create more time with the game without making new levels.
As well as the ever-known maxing out cog suits/gardening/racing/fishing.
You also get a real one when you maximize certain stats, such as once for every gag track you complete and one for maximum gardening shovel points.
Fishing Minigame: There's a fishing pond in every Playground and on every Street. There's Fishing BINGO every Wednesday, sometimes you have to fish for a Toon Task's objectives, and sometimes you fish just because it's one of the most lucrative methods of gaining Jellybeans.
Four Is Death: There are 4 kinds of cogs; Bossbots, Lawbots, Sellbots, and Cashbots.
Level Grinding: Required for most of the higher-level stuff. Gag "camping" is one of the most common, where you fill up with just one or two types of gags, and go hunt lower-level street Cogs to get experience.
Gardening is the most annoying, because you can only pick a flower once a day, and there's only ten flowers you can plant at a time. Worse, even the max-level flowers only give you one point per flower, requiring over a month of real time to level from 7- to 8-bean flowers.
The Maze: The Maze Game. The first stage of the Cog field office buildings involves a maze mini-game where players have to throw water balloons at the Cogs walking around to recover jokes and unlock the exit. The more jokes recovered, the more health restored when you do reach the exit.
One-Man Army: With all of this game's focus on teamwork and friendship, you would not expect something like this. However, if you know what you're doing, along with going to collect the necessary equipment, your toon could become this anywhere in the game. Just ask this guy.
Shout-Out: There are a few of these here and there; For example, one of the buildings in Donald's Dock is called "What's Up, Dock?".
Single Palette Town: Most of the areas of Toontown have their own special colors, especially the Brrrgh and Donald's Dreamland.
Slapstick Knows no Gender: There are four female cogs in Toontown; The Mingler, Number Cruncher, Micromanager, and Name Dropper, all of which can be subjected to the same slapstick violence as the other cogs.
Soft Water: The final Toon-Up gag is a high dive into a cup of water.
Smashing Hallway Traps of Doom: Many of the Cog Headquarters have these, most notably the Sellbot factory which has an area that is quite literally the definition of this trope.
Spiteful A.I.: In the Cog Thief minigame, the cogs try to steal barrels that contain gags, and you try to throw pies at them to make them explode. If they hit you, they explode and you fly into the air. When this happens, the cogs currently on screen will turn away from the money and try to run into you, even though they will instantly explode upon running into you.
Two-Faced: Obviously, the Two Faces and Double Talkers
Uncanceled: Ever since Toontown's closure was announced, fans have taken matters into their own hands and are reviving the game as Toontown Rewritten. Toontown fan sites and forums continue to remain active as well.