In the beta version of Birthday, the copies of the coach in the background weren't green and weren't 3D. They were also wearing boots in a different color than the dancer.
Birthday seems to have lots of changed features: in a picture, her outline is orange instead of light blue; in the preview video, the arrows for the pictograms are fuchsia instead of red; in the Just Dance Awards picture, her outline is faded instead of being thick.
In the Just Dance Now files, there are some unfinished pictograms taken from the Behind-The-Scenes footage.
Beta outline 1
Beta outline 2 with Beta background dancers
Different coloured arrows of the pictograms in the preview
Built For This had green shoes and a different colored belt, as shown in the Beta preview. This beta version appears in Party Master modes in Just Dance 2015 and 2016, and in Uptown Funk's background and Mashup, as well as in Cheap Thrills's Mashup
First, the Get Low dancers had regular white skin, but then it was changed to black. This beta element can be seen in the "Customize your Dancer Card!" icon, where P1's avatar is depicted with white skin.
A woman with brown curly hair, red jacket, yellow shirt underneath, purple skirt with yellow dots, red leggins and brown heels appears in the Ain't No Mountain High Enough Mashup. The game files prove this coach was supposed to be for Respect by Aretha Franklin.
You Never Can Tell by Chuck Berry was supposed to appear in the game too, but only its files are there. This song ended up appearing in Just Dance 2016, covered by A. Caveman and The Backseats with a remade version.
The Just Dance 2015 version's cover appears while downloading a DLC or while uploading an Autodance, and partially in the Playlist menu icon.
In a video showcasing the gameplay of Burn on the PlayStation 4, many glitches are apparent. It may mean that the use of the interface was based on the Xbox 360's final production.
The avatars weren't going to have the sticker appearance, but it was added in the final version.
The effect before the scoring system was equal to Just Dance 2014. Then it was changed, as shown in the full gameplays of 4x4, Macarena, Problem and Built For This: it has an effect similar to Just Dance 4, with squares "closing" the dance and showing the text "Just Dance 2015," but the scoring graphical effects still remain the same.
The menu was less animated and the menu icon of Holding Out for a Hero was different, and the icon for the Party Master Mode was different as well.
The X, OK, GOOD and PERFECT have a bounce effect in Beta versions (like in Just Dance 2014) but it changed in the final version of the game. The Gold Move effect was the same as Just Dance 2014 too.
It was possible to use some preset nicknames for P1 that have been taken out of the game, like "Nintendo_E3," "Gamescom" and "Mii."
Party Master Modes were initially seen alone in the menu (right after the playlist icon); in the final version, they appear in a separated section.
Their icons were totally different as well: they only consisted of the word "PARTY MASTER" written over a Wii U gamepad emblem on a purple background.
The Mojo Coins had a different design.
The menu looks a bit darker and the icons were less animated.
The playlist icon was a bit different in the version from E3 2014: the beta square of You Can Never Tell was seen on it, however in the final version only a very small part of the square is seen.
The song icons were originally going to have the glass effect, like all of the icons in Just Dance 2014, but the effect was removed for some unknown reasons.
Community Remix was originally called "Dance Mix" and it had the Just Dance 2014 interface.