Allusion vs. Plagiarism?

I'm helping a friend write a One Act that she plans to put in production sometime next year. We have alluded to multiple things throughout the play. But now we're unsure on a couple more obvious ones. Does anyone know (or have a feeling) that any of these would be plagiarism?

1

"Flicker. Enter STEPSISTERS.

PAUL: Ah, Heather and Heather,

Flicker. Enter STEPMOTHER.

PAUL: And Heather.

EVA glares at him

PAUL: Come on, they’re literally the Heathers."

2

"ANNOUNCER: Hear ye, hear ye.

PAUL: My name is Samuel Seabury–

EVA: Shh!"

3

"PAUL: (pushing her off, laughing.) What? We’ve been hearing death omens and the lighting’s been defective since we got here. What’s gonna happen?

EVA: Paul.

PAUL: They think me Mac–

EVA: –NOPE!

PAUL: Ambition is my folly. I’m a polymath, a pain in the ass-

EVA: You’re a massive pain."

Please advise. We kinda want to put them on youtube at some point, so we don't want to be struck down.

I'm pretty sure you're good, it's obvious that these are pop culture references and you're not just stealing lines from other works [though I basically live under a rock so I didn't get all of the references]. As long as you make it obvious that you're using quotes from other works and you aren't trying to take credit for lines that you didn't write you should be ok.