When Melody is recording herself with Jess' camera she says she lives in apartment 2C. The rest of the series shows her living in 2D.
When Tamara is sacrificed, she falls to the ground as soon as her throat is cut (as did the maid Rose). This is before she has experienced significant blood loss that would cause loss of consciousness.
Samuel didn't arrive in the modern time with Melody, although they went to same portal at the same time.