 Ezra MillerRobert | Robert |
 Jeremy Allen WhiteDave | Dave |
 Emory CohenTrevor | Trevor |
 Michael StuhlbargMr. Burke | Mr. Burke |
 Rosemarie DeWittMiss Vogel | Miss Vogel |
 Addison TimlinAmy | Amy |
 David CostabileMr. Anderson | Mr. Anderson |
 Dariusz M. UczkowskiPeter | Peter |
 Gary WilmesMr. Virgil | Mr. Virgil |
 Lee WilkofMr. Wiseman | Mr. Wiseman |
 Paul SparksDetective Eclisse | Detective Eclisse |
| BBill RaymondMr. Williams | Mr. Williams |
 Alexandra NeilGloria Talbert | Gloria Talbert |
 Mark ZeislerTom Talbert | Tom Talbert |
 Christopher McCannMr. Ullman | Mr. Ullman |
 Byrdie BellCherry Dee | Cherry Dee |
| MMary MichelsonTalbert Twin | Talbert Twin |
| CCarly MichelsonTalbert Twin | Talbert Twin |
| RRebecca BoughtonBroken Glass Girl 1 | Broken Glass Girl 1 |
| AAnna MaliereBroken Glass Girl 2 | Broken Glass Girl 2 |
| DDani BaumBroken Glass Girl 3 | Broken Glass Girl 3 |
| JJulian BranciforteFreshman Student | Freshman Student |
| MMarta MillerRobert's Mom (voice) | Robert's Mom (voice) |
| AAnnette FoisyNurse | Nurse |
| PPaige BillingsAV Class Girl | AV Class Girl |
| TTony CostagliolaSenior Druggie | Senior Druggie |
| CCameron WardBoys Dorm Head | Boys Dorm Head |
| RRichard WhiteDave's Dad in Car | Dave's Dad in Car |
| CChristopher BrissonSecurity Guard | Security Guard |
| MMackenzie DearyChapel Student | Chapel Student |
