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.
Mid-Season finale.
The bridge that Amanda visits is the Burrard Bridge in Vancouver, Canada.