This episode of "How I Built This Lab" features a special "Advice Line" mashup where host Guy Raz and three former guests—Travis Boersma (Dutch Bros Coffee), Michael Preysman (Everlane), and Chris Ruder (Spikeball)—offer advice to three different entrepreneurs looking to scale their businesses. The entrepreneurs include Andy Atkins of Bad Luck Burger Club, who is deciding between brick-and-mortar and expanding food trucks; Tiffany Narbonne of TeeJazelle, who seeks advice on reaching larger retailers; and Peter Houck of Rink Rabbit, who is contemplating international expansion versus focusing on new products. The experts provide tailored guidance on topics such as bootstrapping versus seeking investment, simplifying brand messaging, and prioritizing domestic growth before pursuing international markets.