Changing your mind about some clips that you placed in the timeline is virtually inevitable, and fortunately removing clips is easy. Just click the offending clip to select it and press the Delete key on your keyboard. Poof! The clip disappears.
If you’re using iMovie, you should know however that when you delete a clip by pressing the Delete key, the clip goes to iMovie’s trash bin. After the trash is emptied (by double-clicking the trash icon at the bottom of the iMovie program window), the deleted clip will no longer be stored on your hard drive, meaning that if you decide you want it back later, you’ll have to re-capture it. Thus, if you simply want to remove a clip from the timeline, I recommend that you first switch to the storyboard, and then drag the unwanted clip back up to the clip browser so you can use it again later if you want.
