After the library is trashed, a boy is shown standing on top of a police car. At first he's swinging a pair of nunchucks, but in the next scene he's holding a crowbar.
When Richie and Carl flee the school to not get busted from the Tip assault, they try unsuccessfully to retrieve their bikes. In the next scene at Richie's place his bike [pennant] can clearly be seen in the foreground.
When Cory shows up at the unfinished house to meet Carl after Richie dies, as she opens the sliding glass doors, it is late in the day, but there's still a lot of sunlight. The very next shot is of Carl's face, with Cory entering through the sliding glass doors in the background, and it is pitch black outside.
Around the 25-minute point, after Mark and his friend beat up Carl, Mark searches Carl for money. In the single shot of Carl on the ground, his shirt is unbuttoned completely. In the following shot (of Mark and his friend walking away), Carl's shirt is mostly buttoned up with just a couple buttons undone at the top.
At one point, Carl, Richie, Corey and here friend leave an unfinished condo after hanging out for a while. When they do, the sun appears to be going down indicating that it is early in the evening, but when Carl arrives near the house where the Texas investors are staying, it looks more like early afternoon than evening.
After Marcy and Lisa tease Carl about his facial injuries, their mic packs are visible under their shirts as they turn to walk away.