The font style is cartoonist and looks like it was drawn with pencils and crayons and is slightly 3D.
The names of the people are bigger and in different font colour.
The position of the text is where ever there is space as it is made big enough to take up the rest of the space.
It makes it look childish that attracts teenagers and a young adult audience which is the target audience of the film.
The text is in capital letters that is conventional in opening sequences as it emphasizes the text.
The title of the film JUNO flashes and glows to tell the audience that this is the title of the film it is also the name of the main character.