James Garner's last film under his Warner Brothers contract. After a writer's strike halted all Warner Brothers productions, even though Garner had a "play or pay" contract, Warner Brothers refused to pay him. Garner sued the studio for breach of contract and won.
McCall's plane is a demilitarized Douglas A-26 Invader, a type used in World War II, Korea, and Vietnam.
$2 million in 1960 would be worth $20 million in 2022.
The A-26 Invader seen this film would be one of over 300 demilitarized A-26s converted by On Mark Engineering Company of Van Nuys, CA. About 40 of those were converted into B-26Ks for the 609th SOS in Vietnam in the late '60s. Many more were converted for ferrying passengers between air bases, but a large number were converted to executive/corporate commuter planes. The plane seen in the film was an On Mark Marksman., but the company also produced the On Mark Executive and the On Mark Marketeer.
This film is about how to do a leveraged buyout, which became highly popular in the financial world 20 years later.