 Large sequences of the movie were deleted to trim the movie down to two  hours. The red journal that was left by Bruces father contained words that  deepened his guilt ("Bruces insists we see a movie tonight...") and made him  feel responsible for his parents death. After Bruce is knocked unconscious  during the attack on Wayne Manor, he loses his memory and does not recall  ever being Batman, but is haunted by a terrible guilt. To face his fear,  Bruce ventures into the heart of the cave where the journal is, and reads the  end of the sentence that cleanses his guilt ("but Martha and I have our  hearts set on Zorro, so Bruces movie will have to wait for next week") The  giant bat then appears, and Bruce stands eye to eye with it. After his memory  returns, Bruce triggers a hidden button that reveals a second layer to the  batcave, where the Batwing, Batboat, and the experimental sonar suit were  kept (thus explaining why they escaped Riddlers wrath).