Sonic, Pit, Fox, Falco, and Lucario are the only characters to have their English voice actors changed from Brawl to SSB4.
Sonic is the only one to use reused voice clips from another game, and the only one to switch from being voiced in Japanese and English only to being dubbed in other European languages.
Shadow is the only Assist Trophy character to have his voice actor changed from Brawl to SSB4.
In Super Smash. Bros and Super Smash Bros. Melee, despite having his own voice in prior Mario games, Luigi's voice clips are Mario's voice from Super Mario 64 with the pitch raised.
Charles Martinet's surname is misspelled "Martinee" in the credits of the original Super Smash Bros.
Pit (Dark Pit) and Viridi's respective voice actors in SSB4, Antony Del Rio and Hynden Walch, are notably uncredited. This is likely due to their statuses as union-only voice actors employed by SAG-AFTRA.