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Unsure how common they are, but some issues that come to mind include:
(Cisco) AD differences between eBGP, OSPF and iBGP routes.
BGP sync up with OSPF.
Redistribution of routes, including default route, summaries, dynamic OSPF or nailed-up statics for OSPF routes placed into BGP.
Of course, there are many other differences between the two protocols, by the prior are often places you might trip up when using the two together.
