Contradiction with Numbers 9:18
In Numbers 9:18, the Israelites journey based on the commandment of the Lord, whereas Numbers 11:35 suggests a specific unrecorded reason for their movement from Kibrothhattaavah to Hazeroth.
Numbers 9:18: At the commandment of the LORD the children of Israel journeyed, and at the commandment of the LORD they pitched: as long as the cloud abode upon the tabernacle they rested in their tents.
Contradiction with Numbers 33:16-17
In Numbers 33:16-17, different stages of the Israelites' journey are listed in a manner that doesn't mention the incidents in Numbers 11:35, suggesting discrepancies in the recorded sequence of events.
Numbers 33:16-17: And they removed from the desert of Sinai, and pitched at Kibrothhattaavah. [Kibrothhattaavah: that is, the graves of lust]