Continuity mistake: The positions of the cats on Selina's table changes instantly between shots. They swap places and are suddenly doing different things. (00:30:20)
Continuity mistake: As Selina is about to make her cat suit, she grabs a pair of blue handled scissors, yet in the next shot they're pink. (00:31:05)
Continuity mistake: When Selina is creating her Catwoman suit, the items she tips out from her sewing kit box change formation and position. (00:32:25)
Continuity mistake: The position of the manhole cover, in relation to the manhole changes and the snow around it clears. (00:32:55)
Continuity mistake: When the penguin is going through the birth certificates in the library, he finds a certificate and begins to write. The name of the baby on the certificate is 'Peter Lindsey' but the penguin writes down 'Matthew Gruen.' (00:36:15)
Continuity mistake: When Oswald is in The Hall of Records, it is snowing heavily. In the next shot of Batman coming around the corner in his batmobile, it isn't snowing. In all following shots it's snowing heavily again. (00:37:55)
Continuity mistake: When the Penguin goes to visit his parents grave, the umbrella he drops before he walks up to it changes position between shots, alternation from beside / in front of the bush. (00:39:10)
Continuity mistake: When the penguin is at his parents grave, as he kneels, between shots the roses he holds change completely. In one shot one of the roses has a leaf on the stem, right under the rosebud. In the next shot the leaf has vanished. (00:39:20)
Continuity mistake: When Catwoman saves the woman from the alleyman, she has high heels on, but after she says "I am Catwoman. Hear me roar." she starts doing backflips, and clearly has flat black shoes on. (00:41:45)
Continuity mistake: When Max is talking to Bruce in his office, the pen and the tray with the coffee pot on it move closer between shots, as Max gets up from his chair. (00:43:00)
Continuity mistake: When Max Schrek leads the Penguin over to the image consultants, two women standing behind them suddenly vanish. (00:48:40)
Continuity mistake: Max's big outer coat and his patterned scarf suddenly disappear between shots, when he leads the Penguin over to his image consultants. (00:48:45)
Continuity mistake: When Max leads the Penguin over to the two image consultants, Josh, the male one, reaches back with his right hand for a cigar. In the next shot he's using his left hand. (00:48:45)
Continuity mistake: When the Penguin bites the guy on the nose, while he is talking to Max Shreck afterward the blood on his face is there, then it disappears, then it's there again. (00:49:40)
Continuity mistake: After the Penguin bites the male image consultants nose, he has no blood on his chin. In the next shot it is covered in blood. (00:49:45)
Continuity mistake: As Oswald and Max talk beside the water cooler, the shape, size and prominence of the blood on Oswald's shirt, beside his black scarf, changes a few times. (00:49:45)
Continuity mistake: The position of the fish beside the water cooler changes between shots. (00:51:00)
Continuity mistake: The little Bat-Gadget that Batman programs, to knock out the four gang members changes from sailing at head height, to suddenly at about a foot off of the ground between shots, so that the poodle can snatch it. (00:53:00)
Continuity mistake: In Schreck's department store, when Catwoman is doing her cartwheels, her heels collapse. (00:53:40)
Continuity mistake: Catwoman's high heels are missing when she jumps on the bouncing-mat in the toy store. (00:53:45)
Answer: Nothing was stopping them. After Penguin's true nature was revealed, they most likely started searching the entire sewer system but couldn't find where his lair actually was so they had no choice but to give up.