What blows my mind is how much depth is required in the back seat. In most compact, economy, or sporty cars, put an infant seat or other rear facing seat behind the driver, and the driver is just about stuffed into the steering column.
Also maybe there's a triple seat models rather than getting 3 singles...?
Quite a contrast from my memories of being a kid sliding about on the back seat of a Mini without so much as a seatbelt.