It varied. The biggest difference is the Canadian interviews covered a lot more ground and asked very specific, fact-based questions. I interviewed for a bioinformatics research position at some podunk Sunflower genomics lab at UBC, and their several hour long interview consisted of questions that went pretty deep on C++, Perl, Linux sysadmin stuff, and molecular biology, and was followed by a round-table interview where ~15 people grilled me on like, BS HR stuff (stereotypical "give us an example of how you used conflict resolution in the workplace" type questions). For a position that paid around $40K! That's probably the toughest interview I've ever given. It's mind-boggling that they are able to hire people, in retrospect.