The first names of Mr. Cantanzio, the Filipino patient, and his uncle are the same as then-dictator of the Philippines, Ferdinand Marcos.
In Jack Morrison's dream, Peter White mentions that he has seen Wendy Armstrong, Eve Leighton, and Jack's wife Nina, characters who died during season two.
Ellen Bry does not appear in this episode.
This is the final episode for Terence Knox/Peter White until season 5's "Afterlife". Peter's final moment in Sweet Dreams is one of the most chilling moments of the series.