I have some 1840 questions of my own:
1) Barnabas travelled back in time to 1840 via the i-ching to save Julia (just as Julia had done to 1897 to save Barnabas, a neat Barnabas-Julia reciprocity here). Yet when Barnabas and Julia return to the present, they BOTH do so by the stairway through time. Why didn't Barnabas return from 1840 via the i-ching just as he had gone there, and what happened to Barnabas' physical body in 1970 in the i-ching trance? Did his i-ching entranced physical body mysteriously disappear when he and Julia traversed the stairway through time to return to the present?
2) The ghost of Gerard (aka Judah Zachery possessing Gerard's body) is haunting Collinwood in 1995 and in the present, and brings about the destruction of Collinwood in the present. Questions surrounding Gerard: Did he become master of Collinwood in the UNALTERED timeline? If so, for what did he need to exact revenge on the Collins' in the present, if he got what he wanted in 1840? Also, why did he wait until 1970 to destroy Collinwood? If he became master of Collinwood in the unaltered timeline, what eventually happened as far as the Collins' family history timeline is concerned? Did something happento depose Gerard as master of Collinwood in 1840?
If he did not become master of Collinwood in 1840, then what was it that Barnabas and Julia sought to change in 1840?
3) Angelique, as 'Miranda' in 1692, testified against Judah Zachery in court, leading to his execution as a warlock. What eventually caused Angelique's turn to evil ways as a witch ( obviously she was one before she met Barnabas in 1795 and became jealous over him)?