From one sense to another, aurally Sonic Adventure has an impressive mixture of music as well as classic sound effects from the 2D games. (consoleob.com)
Along with various other classic sound effect techniques, the film also depicts human voice actors providing not only the dialogue, but also the haunting singing used for the soundtrack as well as the deranged vocal sounds of the supernatural characters. (blog.cinemaautopsy.com)
There is plenty of rehashed old well known dialog from the first two classic movies, similar shots of the creatures, similar jump moments, the same classic sound effects etc... (rottentomatoes.com)