How about the ones where the raiding party goes to the right street number on the wrong street? (Yeah, these have happened, too.) Seriously -- to get the warrant they have supposedly had the place under observation long enough to be able to swear on an affidavit that they have probable cause to believe there criminal activity. After all this observation, they can't even find the right street when it comes time to make the raid?
This happens when the people observing the property where the warrant is to be served are not people involved in the actual warrant entry. Of course, not all properties have been under observation before a warrant is issued. They don't ride in with the entry team and they don't direct the entry team during entry activities.