Billy The Puppet Cameo
This easter egg can be seen in all versions of the movie.
Near the end of the movie when Jamie Ashen and the detective find Mary Shaw’s puppet collection in the glass cases, the camera follows them as they slowly make their way toward the clown doll in the rocking chair.
If you look on the floor to the right of the baby stroller you can see Billy the Puppet, the doll from the Saw movies, sitting on the floor propped up against a support beam.
James Wan directed both Dead Silence and is one of the founders of the Saw movies, which makes this easter egg not so surprising since Wan has a habit of sneaking Billy into his other movies as seen in Insidious.