Definitely, Maybe

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• DIRCAMEO(Adam Brooks): The used bookstore owner.
• Movie Goof (incorrectly regarded as a mistake): During the scene where Will and April are smoking outside the store we see that Will's cigarette has a white filter. Will bought Morley Reds, which is a fictional brand used in movies. The pack has the appearance of Marlboro Reds, which have always had brown filters, leading some people to think his cigarette was a goof.
• Movie Goof (continuity error): During the scene where Maya convinces Will to tell about his past relationships, her braid switches from being on her shoulder to hanging down her back in between shots.
• Movie Goof (continuity error): When Will goes to visit Summer, Hampton opens the door with his glasses hanging partly under his chin. He adjusts it correctly and then invites Will in. When they're inside the apartment, Hampton's glasses is crooked and under the chin again.