Saul Rubinek plays Dr. Carl Carlson in this episode. Saul Rubinek will go on to play Artie Nielsen in Warehouse 13 (2009) which is a sister show to Eureka (2006) and had many charactor cross-overs.
Henry says, "Now, most people use maybe 10% of their brain at any one time." This assertion is meaningless. Some folks believe this myth arose from misinterpreting the fact that only 10% of the cells in our brains are neurons, while the other 90% are glial 'helper' cells.
When Carter is trying to talk Carl out of jumping off the bridge, he climbs over the rail and the whole bridge shakes. Obviously no real bridge of this type would do this.