Continuity mistake: Once Doomsday is frozen, a shot from behind him shows a van behind him partly covered in ice from Superman's breath. The back side window is a full glass window. Then a little later after Doomsday breaks free and Superman pushes him back, suddenly the side window is a solid metal piece. Also the ice on the ground becomes thick snow suddenly and the van's door handle disappears.
Picture added by Quantom X