When Al lifts up the dumpster to free Drill Instructor Sgt. Fletcher, the dumpster doesn't move.
Al's National Guard unit is ordered to "23rd and Addison" to pick up trash. This location is non-existent. Addison Street runs east/west from Lake Shore Drive past Wrigley Field to Schiller Woods and then resumes as Addison Avenue and runs to O'Hare Airport. Along its route, it never crosses a numbered street or avenue.