The last times green kryptonite was heated up to an explosion heat it made black kryptonite that split Lex in two and then put him back together. When Kara used her heat vision to blow up the green kryptonite that was near Clark it just exploded and didn't separate him.
When Kara is in the jail cell, she bends the bars. All the shots that include the bars have the bars in a different shape. They go from bent outwards, to bent inwards, then to straight.
The announcement of the pageant contestants contains a few errors in regards to the order of shown contestants. The contestants are standing in line when Clark arrives just in time to hear Kara announced, even though she was clearly just third in line. The girl that was previously called first (Cindy Walker) is now in line again behind Kara, to be called again, and the girl previously second in line (Elizabeth Johnston) switches positions.