If you’re an adult and dream of inflatable bouncy castles, it means you miss playing in them. You may have a deprived childhood and missed out on childhood games, the playground and entertainment.
Other dream interpretations are about possible interrupted developmental growth. Your subconscious ness may be calling for attention to be addressed to the problems. You may be stuck at a certain stage and unable to progress. Your old issue is surfacing to trouble you in your present life.