THEME:   phrases containing EDEN, but not as its own word   
GOOD ONES:     Classic children's novel {& theme}   THE SECRET GARDEN   
Mad man?   ALFRED E. NEUMAN   
Auction ending?   EER   
Helpful tip for a puzzle solver?   ERASER [tip of the pencil]   
Leaves in a bag   TEA   [not the verb]   
BTW:   "ANON, the dreadful thunder…" from 
Hamlet is right up there with "What, ho!" as a memorable quotation.      
Kubrick's out-of control computer   HAL [if you wanted to use The Bard, "Shakespearean prince" would have served]      
"Hold your horses, I'm coming"   IN A SEC [the clue indicates impatience; the answer means and suggests only 
soon]      
"Rockin' Robin" chorus word   TWEET [embarrassed to say that I knew that, but I had successfully blocked it from memory till now]          
RATING:    
 
 
Three grins = Loved it; Two grins = Enjoyed it; One grin = A bit bland for my taste; One teardrop = Not much fun