I loved the dialogue, the Americanisms (Leah: It's probably just a food baby. Did you have a big lunch? Juno MacGuff: No, this is not a food baby all right? I've taken like three pregnancy tests, and I'm forshizz up the spout.), the humour, the emotion and the treatment of the subject of teen pregnancy.
Juno is way cute. Bleeker is well, Bleeker. You have to see him to believe it. In Juno's words, he's the cheese in her macaroni! :)
Her relationship with her father and step-mom is weirdly beautiful. One of my favourite scenes is when Juno asks her dad if two people in love can really stay together.
For the record, I believe they can. :) Do watch!
P.S. Orange Tic Tacs rule! :)