Sources:

Keith and Kent Zimmerman: 'Sing My Way Home - Voices Of The New American Roots Rock', page 35 (Backbeat Books, 2004).

According to Bonnie Bramlett, the whole album was recorded in about four hours in producer/engineer Bruce Botnick's house in Los Angeles, CA. There were no multiple takes. The session lasted a single night. Twelve songs were elected as keepers. There were no drums, just a briefcase. "All that percussion on 'Going Down The Road Feeling Bad' was me [Bonnie Bramlett], Gram Parsons and Duane Allman smacking our laps. As a matter of fact, Duane played briefcase, too. Briefcase, lap and slide guitar".

Conclusion: Duane Allman plays slide guitar on three tracks, but it is quite possible that he also plays briefcase, lap smacking and guitar on some of the other tracks.

In his book "A Rock 'n' Roll Autobiography" (McFarland & Company, Inc., Publishers, 2011, page 64) Bobby Whitlock writes about the recordings for 'Motel Shot':

"It was recorded in two days. One day at Bruce Botnick's house and the other at Alan's [manager Alan Pariser] house."

According to Bobby Whitlock these recordings took place just before he went to England to join Eric Clapton in May 1970.

In 'Rolling Stone' from August 6, 1970 a fall 1970 release of 'Motel Shot' was announced. But eventually the album would not be released until March 1971.

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