this error is caused by using a name with spaces for te departre location form field:
<input type="text" onblur="hideServerError('Departure Location_ServerError');" tabindex="4" class="formTextfield_Medium" value="" name="Departure Location" id="Departure Location">
spaces are not valid in form field names.
for the issue with the bottom of the page, in the webassist/forms/fd_newfromblank_default/Datepicker/css/jquery-ui-1.7.1.custom.css file
change:
.ui-helper-clearfix { display: inline-block; }
to:
.ui-helper-clearfix { display: none; }