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Combo wants the kid away from his drug dealing and away from any potential violence. He doesn't expect the kid to be the source of the violence. The kid is obviously horrifed by what's going on forcing innocents into violence harms both them and their victims.

It's suggested that Walt get a lobectomy, which is a massive, drastic surgery, but which might keep him from getting cancer again. Sometimes, drastic measures are needed. Walt agrees immediately, rather than waiting. He's gotten used to taking drastic measures.

Walt asks which one Combo is. He can't be bothered to treat the people who work for him like people unless he gets something out of it.

Jesse wants to get revenge for Combo, but he's in a bad place, strength-wise. Everybody knows he didn't kill Spooge, so even though he hated people thinking that, he can't use it to his advantage.

Walt refuses to reveal to Saul that he's in remission. It's probably because he sees it as personal information, but there's also the fact that Walt is concerned about losing his "get out of crime free" card. He probably doesn't want Saul to assume he can hold Walt responsible for things at a later date.

Saul decides to set up a proper, business relationship with a distributor, which means Gus

Jesse takes responsibility for Combo's death. While he isn't the murderer, he is the one who got Combo into this dangerous business, and he's aware of that. Jesse' ability to admit that helps contrast him with Walt. However, he does reject the idea of going to an anonymous meeting with Jane, chosing to go off and smoke meth to deal with Combo's death. Jesse is fine with accept ing responsibility, but part of that means that on some level, he's convinced that he's just inherently a bad person, and it's not worth trying to change that.

There's really something to be said about the fact that Gus' legitimate business is fast food, which also entails peddling something pleasurable but unhealthy

And now I'm craving fried chicken

The ultrasound for Holly is when Holly becomes a real person, and stops being just a cipher.

Skyler hosting Ted's birthday party is a clear parallel to her setting up Walt's party at the beginning of the series, helping set up her eventual relationship with Ted, and the fact that Skyler is explicitly only turning to Ted because Walt doesn't offer what she needs from her husband any more

Even Saul is unaware exactly who Gus is, since Gus is so good at keeping the two halves of his life seperate, and using his respectable image to stay above suspicion.

Gus rejects the idea that he and Walt are alike, despite the show setting Gus up as basically a successful Walter. Walt got used to being a big fish in a small pnd and being able to outstrip other drug dealers, and now he's the one in that position.

SKyler realizes Ted is a criminal, because he's not good enough at covering his tracks. He justifies it on the basis that he can use that revenue to look after his workers, just like Walt justifying what he does for family. If Gus is a more successful Walt, Ted is a morally better but less intelligent Walt

Jesse missed COmbo's funeral because he's so tangled up in himself. He's letting his guilt keep him from doing things that would alleviate the guilt

The elaborate Heroin preparation scene is the first time Breaking Bad really gets into the minutiae and ritual of drugs, which is strange, because a lot of other media that brings up addiction (see, Infinite Jest) really focuses on the ritual, and how the ritual eventually goes from something with near-religious significance to something which is just tedious. This is also when Jane falls off the wagon, since as much as she and Jesse care for each other, he's pulling her away from why she wanted to quit.

Jesse's heroin high is framed as him floating away. When he's using heroin, he feels like he can escape the weight of his life, which is what makes heroin so dangerous.

Walt tells his class to turn phones off, and his spare phone (hidden in the ceiling and on vibrate) immediately goes off, which is just funny

And the episode ends with Walt being about to have to choose between family and drug-dealing, when he hears the baby's coming