I know that when apartments arrived, Sims and objects could be stuck in the cavity spaces around elevators.
They can also get stuck under the stairs at Harbor Quarter Gym - ie down where the swimming pool is.
You can bypass this by dragging the outer walls out- the ones next to the stairs - to allow Sims to escape if they sucked under the stairs. This will not affect the upper floors of the Gym - so it is a safe and tidy solution.
Also, the Harbor Quarter Gym is an aggressive environment whereby Sims are forced to walk up/down stairs - walk 10 miles - then walk up/down the opposite stairs. You can muzzle the aggression by simply replacing the aggressive windows on the ground floor (that split reception and the gym) with doors - this allows Sims a very nice way of entering and exiting the gym without being bullied to use the aggressive stairs - that can also trap Sims.
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Without those doors - all Sims would have to use the aggressive stairs.
You can see the trapped Sim is now able to walk out of their hostile environment.
There was also one lot where I built the house, and Sims would walk right through it like it was not there. Right through the house, counters, fridge, and right out the other side and back onto the street. This was annoying, but ever once in a while a Sim would get stuck between the counter and fridge. What was worse, this kept happening in a house where I was doing the Room Challenge, and my Sim was not allowed to talk to anyone or leave the house, so even when I reset the Sim to get them unstuck, I could not tell them to leave, and there was no door. Each time it happened, it voided my challenge, so I would have to go back to an earlier save.
Fun must be always -- Tomas Hertl (San Jose Sharks hockey player)
It is helpful tips that you have posted to help to prevent sims from being stuck.
http://forums.thesims.com/en_US/discussion/817478/hello-come-and-introduce-yourself
http://tinyurl.com/OneRoomOneWeek
http://tinyurl.com/rosemow
My Showcase thread https://forums.thesims.com/en_US/discussion/948861/rosemow-s-rooms-showcase