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.
The Bank has 32 houses and 12 hotels (in most versions) because the players are supposed to upgrade their houses to hotels, returning the houses to circulation. The rules prohibit building more houses when all the houses are on the board. This makes it a very profitable strategy to buy lots of houses without ever upgrading them to hotels, as it prevents the other players from buying any.
To make even more sense of this, one hotel requires four houses to be turned in, in addition to the price of the house. Thirty-two divided by 4 is 8, so if you have three monopolies (let's just say Boardwalk and Park Place, and the two monopolies between Jail and Free Parking) and all eight of those properties have four houses on them, nobody can build any houses until you decide to upgrade.
If a player gets a non-utility/non-railroad monopoly early and immediately builds houses, it usually quickly cripples his/her opponents.
The orange and red properties, when developed. Jail is the most commonly occupied space. The oranges are 6, 8 and 9 spaces away. The reds are 11, 13 and 14 (and one of them has a Chance card that sends you directly to it). Basically, anyone leaving Jail has VERY HIGH odds of landing on at least one of those properties in 1 to 3 turns.
Seinfeld Is Unfunny: Since it's been the best-known and most commonly played commercial board game in the Western world for nearly eight decades, it's probably not too surprising that a lot of folks have become a little sick of Monopoly by now. Check in at BoardGameGeek.com sometime to peruse the litany of complaints that many folks have with the game.