The interviewer: check their online profile; you may have a shared history or connection and you’ll then recognize them from their photo.
The company: have they been in the news recently? Have they won an industry award? Has there been a merger or acquisition? Make sure to drop this your knowledge of this information into the conversation.
The project or industry: have there been any hiccups or issues? Have there been any developments in the sector or region which could impact the project or any recent regulatory changes?
Check the route: where possible visit the location before the interview to check for traffic issues or construction. For interviews to a site, allow plenty of time to get through security and registration; find out in advance if there is parking for you. At the very least look at Google Street View to see the site layout.