Crossed with Foreshadowing, in the very beginning of the game, before the baby goes to sleep, you can see that the mother isn't wearing a ring, but you can also see the tanline where it would be if she had it on. Combined with the Interface Screw when the mother goes to answer the door and starts yelling, perceptive gamers might pick up on the general plot of the game long before they reach the end.
You might spend much of the game thinking "why is this toddler not screaming in fear? This is really unrealistic." When you see the ending, you finally realize the toddler has learned not to cry or yell to avoid their mother's drunken and/or hungover rage.
Most of the text in the game is written in illegible scribbles, with the only exceptions being the alphabet blocks scattered around. The Fridge Brilliance sets in when you remember that the protagonist is barely two years old; the toddler can't read yet!
Teddy's dialogue is written such that, taken at face value, he's a very comforting presence, but his tone is creepy and invokes Paranoia Fuel. Given that Teddy represents the player character's father, this makes total sense: all the kid would know about their dad is that mommy doesn't seem to like them very much, so of course they're going to be wary around him.
