At the start, when Daffy sees the trappers being paid for their pelts, the line is out the door. When Daffy goes to check it out, suddenly the trappers are all gone and no one is at the Trading Post.
After Daffy drops a load of dynamite into Bugs' hole, he pulls the spool of wire to the detonator, drops the spool, and grabs the detonator handles, but he never connected the wires to the detonator. Therefore, when he finally pulls and then pushes the plunger, nothing should have happened. There are wires connected to the detonator, but they were there before Daffy pulled the spool of wire to it (and were not connected to the spool), dropped the spool, and grabbed the handle - again, no connection.
Daffy and Bugs Bunny leave no footprints in the snow but you do see footprints from a bear in the snow.