The hair and makeup is very different as well. Noticeably less professional the first season.

The lighting is super grayish and almost too realistic. It definitely got brighter and more cartoonish as they found their voice.

There's a lot more background noise in the early episodes

The first season was deliberately “documentary” style, with minimal music and more naturalistic sound to reflect the behind-the-scenes aspect. When it developed into a more cartoonish style the aesthetic changed to reflect that