The little yellow guitar Marty connects to the huge speaker at the start of the trilogy is a Chiquita Travel Guitar.
Marty's skateboard is a Valterra 'Splatter'.
The guitar Marty plays at the Enchantment Under The Sea dance is a Gibson ES-345 with a Bigsby vibrato plugged into a Fender 59 Bassman amplifier.
The clock by Marty's bed is a Panasonic RC-6015.
The watch Marty wears is apparently a Casio CA53W-1.
Marty's personal stereo is an Aiwa HS-PO2 MkII.
George eats from a bowl of peanut brittle in 1985, this is Sophie Mae's Peanut Brittle, which you can still buy now! George has a half pound box.
The video camera Marty videos the Doc with is a JVC GR-C1U.
Biff drives a '46 Ford Super DeLuxe Convertible
The car Marty takes Lorraine to the dance in is a 22nd series Custom Eight Packard convertible.
The 4x4 in the garage is a 1984 Toyota SR5 Xtra Cab
The guitar Marty plays at the audition and has next to him on his bed is a Black Ibanez Roadstar Series II.
The magazine George has by his bed with the picture of the robot on the front is the Fall 1954 issue of Fantastic Story Magazine. The one he holds in his hand is Thrilling Wonder Stories, Winter 1955.
The walkie talkies Doc and Marty use are Archer Space Patrol Walkie-Talkies.
Griff drives a heavily modified 1976 BMW 633 CSi.
The taxi which gives old Biff a lift is a heavily modified 1972 Citroen DS.
The car which almost knocks Marty Jr. down, is a heavily customised 1989 Ford Probe.