Bethsaida section: 6:45-8:21. Most used by Matthew, but none by Luke. This section is pseudo-Marcan, but does not come from Mark's pen; it was added by a member of Mark's community, probably in the Galilean area where Matthew got a hold of it. See my Bethsaida project.
At any rate, this pericope has the classic Canonical/Secret Marcan blend of magic, marvels, and resurrection. The crowd are "struck with amazement" (15) and the demon is a "deaf and mute spirit" (17). In verse 25-28, Canonical Mark adds: and said, "You deaf and mute spirit, come out of him and never enter him again... And [the boy] became like dead, so that many said "He died". But Jesus grasped his hand and raised him up, and he rose. This is magic as seen (or, perhaps, revealed) in Canonical Mark's 7:31-37 and 8:22-26.
I have taken the middle road. I believe that the impatience and crowds were original to Mark, which Matthew and Luke agreed were overstated. However, the magical formulae, amazement, and resurrection are Secret/Canonical Mark's additions.