The episode title, "End of Line", is a computing term relating to the end of a line of text. The phrase was often used by the Cylon hybrids in Battlestar Galactica (2004), as well as the MCP in Tron (1982). Coincidentally, one of Caprica's plotlines involves a computer chip called an MCP.
The cellphone Lacy is forced to use is actually a Nokia 6630 3G smart-phone, released in November 2004 and succeeded by 6680 in May 2005, making the 6630 quite retro by the time this episode first aired in March 2010.
The bridge that Amanda visits is the Burrard Bridge in Vancouver, Canada.
Mid-Season finale.