Contradiction with Exodus 1:11
Exodus 1:11 describes the Israelites being oppressed with burdens by taskmasters, while Exodus 5:5 presents Pharaoh accusing the Israelites of being numerous and resting from their burdens, implying they are not burdened enough.
Exodus 1:11: Therefore they did set over them taskmasters to afflict them with their burdens. And they built for Pharaoh treasure cities, Pithom and Raamses.
Contradiction with Exodus 5:16
Exodus 5:16 states that the representatives of the Israelites are being beaten for not meeting their quotas, whereas Exodus 5:5 accuses them of being idle and too numerous, suggesting they are not working hard enough.
Exodus 5:16: There is no straw given unto thy servants, and they say to us, Make brick: and, behold, thy servants [are] beaten; but the fault [is] in thine own people.