Continuity mistake: Flash uses a speed boost of energy in his arm to fling the gray adhesive substance at Reverse Flash, slamming him into a glass display case and trapping him to it. The glass of the case breaks and cracks and the cracks around Reverse Flash's head are quite large. But after Batman makes his entrance and grabs Citizen Cold, that shot shows the cracks a lot smaller and shorter. They are back the way they were in following shots.
Picture added by Quantom X
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